TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Sequences: The nucleic acid encodes a first polypeptide and a second polypeptide, where each of the first and second polypeptides is no more than 1500 amino acid residues, and where each of the first and second polypeptides comprises an amino acid sequence selected from SEQ ID NOs: 64-74 and 91-133. The nucleic acid encodes a first polypeptide, a second polypeptide, and a third polypeptide, where each of the first, second, and third polypeptides is no more than 1500 amino acid residues, and where each of the first, second, and third polypeptides comprises an amino acid sequence selected from SEQ ID NOs: 64-74 and 91-133. The nucleic acid encodes a first polypeptide, a second polypeptide, a third polypeptide, and a fourth polypeptide, where each of the first, second, third, and fourth polypeptides is no more than 1500 amino acid residues, and where each of the first, second, third, and fourth polypeptides comprises an amino acid sequence selected from SEQ ID NOs: 64-74 and 91-133. An isolated nucleic acid encoding a polypeptide comprises an amino acid sequence selected from (i) EVEN SEQ ID NOS: 2-22 or SEQ ID NO: 88, (ii) a homolog of EVEN SEQ ID NOS: 2-22 or SEQ ID NO: 88, (iii) a conservative variant of EVEN SEQ ID NOS: 2-22 or SEQ ID NO: 88 comprising one or more conserved amino acid substitutions selected from Ala to Cys, Gly, or Ser, Arg to Ile, Lys, Met, or Orn, Asn to Asp, Gln, Glu, or His, Asp to Asn, Gln, or Glu, Cys to Met, Ser, or Thr, Gln to Asn, Asp, or Glu, Glu to Asn, Asp, or Gln, Gly to Acp, Ala, or Pro, His to Asn or Gln, Ile to Leu, Met, or Val, Leu to Ile, Met, or Val, Lys to Arg, Gln, Glu, Ile, Met or Orn, Met to Cys, Ile, Leu, or Val, Phe to His, L-Dopa, Leu, Met, Thr, Trp, Tyr, 3-phenyiproline, 4-phenyiproline, or 5-phenylproline, Pro to L-1-thioazoiidine-4-carboxyiic acid or Dor L-1-oxazolidine-4-carboxylic acid, Ser to Cys, Met, or Thr, Thr to Met, Ser, or Val, Trp to Tyr, Tyr to L-Dopa, His, or Phe, and Val to Ile, Leu, or Met, or (iv) a sequence having at least 35% sequence identity with EVEN SEQ ID NOS: 2-22 or SEQ IDNO: 88. The nucleic acid encodes a polypeptide comprising an amino acid sequence selected from a sequence having at least 35-80% sequence identity with EVEN SEQ ID NOS: 2-22 or SEQ IDNO: 88. The nucleic acid encodes a first polypeptide and a second polypeptide, where each of the first and second polypeptides comprises an amino acid sequence selected from (i) EVEN SEQ ID NOS: 2-22 or SEQ ID NO: 88, (ii) a homolog of EVEN SEQ ID NOS: 2-22 or SEQ ID NO: 88, (iii) a conservative variant of EVEN SEQ ID NOS: 2-22 or SEQ ID NO: 88 comprising one or more conserved amino acid substitutions selected from Ala to Cys, Gly, or Ser, Arg to Ile, Lys, Met, or Orn, Asn to Asp, Gln, Glu, or His, Asp to Asn, Gln, or Glu, Cys to Met, Ser, or Thr, Gln to Asn, Asp, or Glu, Glu to Asn, Asp, or Gln, Gly to Acp, Ala, or Pro, His to Asn or Gln, Ile to Leu, Met, or Val, Leu to Ile, Met, or Val, Lys to Arg, Gln, Glu, Ile, Met or Orn, Met to Cys, Ile, Leu, or Val, Phe to His, L-Dopa, Leu, Met, Thr, Trp, Tyr, 3-phenyiproline, 4-phenyiproline, or 5-phenylproline, Pro to L-1-thioazoiidine-4-carboxyiic acid or Dor L-1-oxazolidine-4-carboxylic acid, Ser to Cys, Met, or Thr, Thr to Met, Ser, or Val, Trp to Tyr, Tyr to L-Dopa, His, or Phe, and Val to Ile, Leu, or Met, or (iv) a sequence having at least 35% sequence identity with EVEN SEQ ID NOS: 2-22 or SEQ IDNO: 88. The nucleic acid encodes a first polypeptide, a second polypeptide, and a third polypeptide, where each of the first, second, and third polypeptides comprises an amino acid sequence selected from (i) EVEN SEQ ID NOS: 2-22 or SEQ ID NO: 88, (ii) a homolog of EVEN SEQ ID NOS: 2-22 or SEQ ID NO: 88, (iii) a conservative variant of EVEN SEQ ID NOS: 2-22 or SEQ ID NO: 88 comprising one or more conserved amino acid substitutions selected from Ala to Cys, Gly, or Ser, Arg to Ile, Lys, Met, or Orn, Asn to Asp, Gln, Glu, or His, Asp to Asn, Gln, or Glu, Cys to Met, Ser, or Thr, Gln to Asn, Asp, or Glu, Glu to Asn, Asp, or Gln, Gly to Acp, Ala, or Pro, His to Asn or Gln, Ile to Leu, Met, or Val, Leu to Ile, Met, or Val, Lys to Arg, Gln, Glu, Ile, Met or Orn, Met to Cys, Ile, Leu, or Val, Phe to His, L-Dopa, Leu, Met, Thr, Trp, Tyr, 3-phenyiproline, 4-phenyiproline, or 5-phenylproline, Pro to L-1-thioazoiidine-4-carboxyiic acid or Dor L-1-oxazolidine-4-carboxylic acid, Ser to Cys, Met, or Thr, Thr to Met, Ser, or Val, Trp to Tyr, Tyr to L-Dopa, His, or Phe, and Val to Ile, Leu, or Met, or (iv) a sequence having at least 35% sequence identity with EVEN SEQ ID NOS: 2-22 or SEQ IDNO: 88. The nucleic acid encodes a first polypeptide, a second polypeptide, a third polypeptide, and a fourth polypeptide, where each of the first, second, third, and fourth polypeptides comprises an amino acid sequence selected from (i) EVEN SEQ ID NOS: 2-22 or SEQ ID NO: 88, (ii) a homolog of EVEN SEQ ID NOS: 2-22 or SEQ ID NO: 88, (iii) a conservative variant of EVEN SEQ ID NOS: 2-22 or SEQ ID NO: 88 comprising one or more conserved amino acid substitutions selected from Ala to Cys, Gly, or Ser, Arg to Ile, Lys, Met, or Orn, Asn to Asp, Gln, Glu, or His, Asp to Asn, Gln, or Glu, Cys to Met, Ser, or Thr, Gln to Asn, Asp, or Glu, Glu to Asn, Asp, or Gln, Gly to Acp, Ala, or Pro, His to Asn or Gln, Ile to Leu, Met, or Val, Leu to Ile, Met, or Val, Lys to Arg, Gln, Glu, Ile, Met or Orn, Met to Cys, Ile, Leu, or Val, Phe to His, L-Dopa, Leu, Met, Thr, Trp, Tyr, 3-phenyiproline, 4-phenyiproline, or 5-phenylproline, Pro to L-1-thioazoiidine-4-carboxyiic acid or Dor L-1-oxazolidine-4-carboxylic acid, Ser to Cys, Met, or Thr, Thr to Met, Ser, or Val, Trp to Tyr, Tyr to L-Dopa, His, or Phe, and Val to Ile, Leu, or Met, or (iv) a sequence having at least 35% sequence identity with EVEN SEQ ID NOS: 2-22 or SEQ IDNO: 88. The polypeptide has no more than 100-1000 amino acid residues. The polypeptide has at least 200-250 amino acid residues. The nucleic acid is isolated from a bacterium, a plant, an insect, a yeast, a fungus, an algae, or an animal. The bacterium is of a genus selected from Anaeromyxobacter, Arthrobacter, Bdellovibrio, Blastopirellula, Brevibacterium, Burkholderia, Candidatus, Chloroflexus, Clavibacter, Clostridium, Colwellia, Congregibacter, Desulfatibacillum, Desulfococcus, Desulfotalea, Desulfuromonas, Flavobacteriales, Gemmata, Geobacter, Hahella, Jannaschia, Kineococcus, Lentisphaera, Maricaulis, Marinobacter, Micrococcus, Microscilla, Moritella, Mycobacterium, Neisseria, Nocardia, Opitutaceae, Opitutus, Faenibacillus, Pelobacter, Photobacterium, Photorhabdus, Planctomyces, Plesiocystis, Pseudoalteromonas, Psychromonas, Raistonia, Rhodococcus, Rhodopirellula, Roseovarius, Shewanella, Stenotrophomonas, Streptomyces, Xanthomonas, or Xylella. The nucleic acid is selected from ODD SEQ ID NOS: 1-23 or SEQ ID NO: 87. The isolated nucleic acid further comprises a promoter operably linked to a nucleic acid encoding the polypeptide, where the promoter is an inducible promoter, a constitutive promoter, or a cell-specific promoter, and where the promoter is a T7 promoter, a Pxy1A promoter, a Pgrac promoter, a GAL1 promoter, a GAL10 promoter, or a pTrc promoter. The isolated nucleic acid further comprises at least one additional nucleic acid sequence selected from (i) a regulatory sequence operatively coupled to the nucleic acid encoding the polypeptide, (ii) a selection marker operatively coupled to the nucleic acid encoding the polypeptide, (iii) a purification moiety operatively coupled to the nucleic acid encoding the polypeptide, (iv) a secretion sequence operatively coupled to the nucleic acid encoding the polypeptide, and (v) a targeting sequence operatively coupled to the nucleic acid encoding the polypeptide. The isolated nucleic acid further comprises a selection marker operatively coupled to the nucleic acid encoding the polypeptide, where the selection marker is ampicillin/carbenicillin resistance, kanamycin resistance, chloramphenicol resistance, erythromycin resistance, streptomycin/spectinomycin resistance, or a histidine auxotrophic selectable marker gene. An isolated nucleic acid encodes a polypeptide having the same biological activity as a polypeptide comprising the amino acid sequence selected from EVEN SEQ ID NOS: 2-22. The isolated nucleic acid comprises (i) a nucleic acid sequence selected from ODD SEQ ID NOS: 1-21 or its fragment, or (ii) a nucleic acid sequence that hybridizes to a complement of a nucleic acid sequence selected from ODD SEQ ID NOS: 1-21 or its fragment. The polypeptide has Claisen condensation activity. The polypeptide catalyzes the condensation of two acylthioesters. The polypeptide has oxidoreductase activity. The polypeptide catalyzes the reduction of a ketone. The polypeptide has adenylating activity. Preferred Vector: The vector is a plasmid. The plasmid is pET2lb(+), pCOLADuet-1, pCDFDuet-1, pWH152O, pHTO1, pESC-HIS, pET-21d(+), pETDuet-1, pACYCDuet-1, pTrcHis2A, pMAL-c2X, or pCL1920pTrc. Preferred Cell: The cell is a yeast cell, a fungal cell, an animal cell, an insect cell, a bacterial cell, an algae cell, or a plant cell. The cell is from the genus Escherichia, Bacillus, Lactobacillus, Rhodococcus, Pseudomonas, Aspergillus, Trichoderma, Neurospora, Fusarium, Humicola, Rhizomucor, Kluyveromyces, Pichia, Mucor, Myceliophtora, Penicillium, Phanerochaete, Pleurotus, Trametes, Chrysosporium, Saccharomyces, Schizosaccharomyces, Stenotrophamonas, Kineococcus, Yarrowia, Streptomyces, Actinomycetes, Anaeromyxobacter, Arthrobacter, Bdellovibrio, Blastopirellula, Brevibacterium, Burkholderia, Candidatus, Chloroflexus, Clavibacter, Clostridium, Colwellia, Congregibacter, Desulfatibacillum, Desulfococcus, Desulfotalea, Desulfuromonas, Flavobacteriales, Gemmata, Geobacter, Hahella, Jannaschia, Kineococcus, Lentisphaera, Maricaulis, Marinobacter, Micrococcus, Microscilla, Moritella, Mycobacterium, Neisseria, Nocardia, Opitutaceae, Opitutus, Faenibacillus, Pelobacter, Photobacterium, Photorhabdus, Planctomyces, Plesiocystis, Pseudoalteromonas, Psychromonas, Raistonia, Rhodococcus, Rhodopirellula, Roseovarius, Shewanella, Stenotrophomonas, Streptomyces, Xanthomonas, or Xylella. The cell is CRO cell, a COS cell, a VERO cell, a BilK cell, a HeLa cell, a Cv1 cell, an MDCK cell, a 293 cell, a 3T3 cell, and a PC12 cell. The cell comprises an alteration in a gene involved in the fatty acid biosynthetic pathway. The cell comprises a deletion in a gene encoding an acyl-CoA dehydrogenase. The cell comprises a mutation in a gene encoding acyl-CoA dehydrogenase. The cell comprises a deletion in a gene encoding a thioesterase. The cell comprises a mutation in a gene encoding a thioesterase. The cell additionally comprises an acyl-CoA synthase. The cell additionally comprises a thioesterase. The cell produces a hydrocarbon, where the hydrocarbon is an olefin, and where the hydrocarbon is secreted by the cell. The cell produces an aliphatic ketone. Preferred Hydrocarbon: The hydrocarbon has a delta 13C of -30 to -15. The hydrocarbon has a pMC of at least 80-100. The hydrocarbon is an olefin, where the olefin is mono-unsaturated, poly-unsaturated, di-unsaturated, or tri-unsaturated. The olefin has a carbon chain length of 10-40 carbons. The hydrocarbon is a straight chain hydrocarbon or a branched chain hydrocarbon. The hydrocarbon comprises a cyclic moiety. Preferred Biofuel: The biofuel is a gasoline, biodiesel, or jet fuel. The biofuel is derived from a carbon source. The carbon source is a renewable energy source. The renewable energy source is a biomass. Preferred Method: In the method for producing a hydrocarbon, the substrate is a carbon source, a fatty acid, acyl-CoA, acyl-AMP, acyl-ACP, ct-alkyl-3-keto acid, ct-alkyl-f3-keto ester, or an aliphatic ketone. The productivity of the cell is at least 3-30 mg/L/optical density (OD)600. The method further comprises isolating a hydrocarbon. The hydrocarbon is isolated from the cell. The hydrocarbon is isolated from the medium in which the cell is cultured. The method further comprises cracking or refining the hydrocarbon. The hydrocarbon is mono- unsaturated or poly-unsaturated. The method comprises incubating a substrate with OleA and OleD under conditions for producing a hydrocarbon. The method comprises incubating a substrate with OleA, OleC, and OleD under conditions for producing a hydrocarbon. The method further comprises OleB. The substrate comprises acylCoA, acyl-AMP, or acyl-ACP. In the method for producing an aliphatic ketone, the substrate is a carbon source, a fatty acid, acyl-CoA, acyl-AMP, or acyl-ACP. The productivity of the cell is at least 0.1-12 mg/L/0D600. The method further comprises isolating an aliphatic ketone. The aliphatic ketone is isolated from the cell. The aliphatic ketone is isolated from the medium in which the cell is cultured. The aliphatic ketone has a carbon chain length of 10-40 carbons. The aliphatic ketone is saturated, mono-unsaturated, or poly-unsaturated. In the method for producing a purified polypeptide, the polypeptide is OleA, OleB, OleC, OleD, or OleBC. In the method for identifying an enzyme useful for the production of hydrocarbons, where the OleA shares at least 35-80% sequence identity with SEQ ID NO: 2, 4, 12, or 18, where the OleC shares at least 35-80% sequence identity with SEQ ID NO: 6, 14, 20, or 88, and where the OleD shares at least 35-80% sequence identity with SEQ ID NO: 8, 16, or 22. Preferred Organism: The genomic nucleic acid sequence has at least 80-95% sequence identity to a nucleic acid sequence selected from ODD SEQ ID NOS: 1-21 or SEQ ID NO: 87. The genomic nucleic acid sequence comprises a nucleic acid sequence selected from ODD SEQ ID NOS: 1-21 or SEQ ID NO: 87. The exogenous nucleic acid sequence increases the expression of the polypeptide encoded by the genomic nucleic acid sequence relative to the expression of the same polypeptide in the organism prior to the incorporation of the exogenous nucleic acid sequence under the same conditions. The organism produces an increased amount of a hydrocarbon relative to the production of a hydrocarbon in a wild-type organism under the same conditions. The organism is prepared by deleting or mutating a nucleic acid sequence having at least 80-95% sequence identity to a nucleic acid sequence selected from SEQ ID NO: 5, 7, 13, 15, 19, 21, or 87. The organism is prepared by deleting or mutating a nucleic acid sequence selected from SEQ ID NO: 5, 7, 13, 15, 19, 21, or 87. The organism is from any of the genus stated above. The deletion or mutation of the nucleic acid sequence in the organism results in a decreased production of a polypeptide encoded by the nucleic acid sequence relative to the production of the same polypeptide in the organism prior to deletion or mutation of the nucleic acid sequence under the same conditions. The genetically engineered organism produces ketones. SPECIFIC SEQUENCES - The hydrocarbon-producing gene comprises a nucleotide sequence of ODD SEQ ID NOS: 1-23 or SEQ ID NO: 87, encoding a polypeptide which comprises an amino acid sequence of EVEN SEQ ID NOS: 2-22 or SEQ ID NO: 88. sequences not defined here may be found at ftp://ftp.wipo.int/pub/published_pct_sequences/publication.    EXAMPLE - No suitable example given.