TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Method: Producing a fatty acid derivative further comprises culturing the host cell in the presence of an alcohol selected from ethanol, methanol, propanol, or butanol. The ester synthase gene is obtained from Acidobacteria bacterium, Acidothermus ccllulolyticus, Acinetobacter baumannii, Acinetobacter baylyi, Acinetobacter sp., Aeromonas hydrophila, Aeromonas salmonicida, Alcaligenes europhus, Alcanivorax borkumensis, Alcanivorax jadensis, Alteromonas macleodii, Anaeromyxobacter dehalogenans, Anaeromyxobacter sp., Arabidopsis thaliana, Bradyrhizobium japonicum, Cryptococcus curvatus, Erythrobacter litoralis, Erythrobacter sp., Frankia sp., Fundibacter jadensis, gamma proteobacterium, Hahella chejuensis, humans, Janibacter sp., Limnobacter sp., marine gamma proteobacterium, Marinobacter algicola, Marinobacter aquaeolei, Marinobacter hydrocarbinoclasticus, Marinobacter sp., Methylibium petroleiphilum, Microscilla marina, Moritella sp., Mortierella alpina, Mus musculus, Mycobacterium abscessus, Mycobacterium avium, Mycobacterium bovis, Mycobacterium gilvum, Mycobacterium leprae, Mycobacterium marinum, Mycobacterium smegmatis, Mycobacterium sp., Mycobacterium tuberculosis, Mycobacterium ulcerans, Mycobacterium vanbaalenii, Myxococcus xanthus, Natronomonas pharaonis, Nocardia farcinica, Nocardioides sp., Photobacterium profundum, Plesiocystis pacifica, Polaromonas naphthalenivorans, Polaromonas sp., Pseudomonas aeruginosa, Psychrobacter arcticus, Psychrobacter cryohalolentis, Psychrobacter sp., Reinekea sp., Rhodococcus opacus, Rhodoferax ferrireducens, Rhodococcus sp., Roseiflexus sp., Roseiflexus castenholzii, Saccharomyces cerevisiae, Saccharopolyspora erythraea, Salinibacter ruber, Simmodsia chinensis, Solibacter usitatus, Sphingopyxis alaskensis, Stigmatella aurantiaca, Streptomyces avermitilis, Streptomyces coelicolor, Streptomyces griseus, Tenacibaculum sp., or Ustilago maydis. The gene encoding an ester synthase is wax/dgat, a gene encoding a wax synthase, a gene encoding a bifunctional ester synthase/acyl-coenzyme A (CoA):diacylglycerol acyltransferase, E59, E58, DSM 8798, AtfA1, or AtfA2. The gene encodes a polypeptide comprising the amino acid sequence of SEQ ID NO. 18, 24, 25, or 26, with or without one or more amino acid substitutions, additions, insertions, or deletions. Preferably, the polypeptide comprises the amino acid sequence of SEQ ID NO. 18, with a substitution at amino acid residue 395. The sequences are available in electronic form from the following web site http://seqdata.uspto.gov/;pageRequest=docDetail&DocID=US20110072714A1. Preferred Host Cell: The host cell is a mammalian cell, a plant cell, an insect cell, a yeast cell, a fungus cell, a filamentous fungi cell, a cyanobacterial cell, or a bacterial cell. The host cell is genetically engineered to express, relative to a wild-type host cell, (i) a decreased level of a gene encoding a fatty acid degradation enzyme, (ii) a decreased level of a thioesterase gene, a decreased level of a gene encoding an acyl-CoA dehydrogenase, and (iv) a decreased level of a gene encoding an outer membrane protein receptor. The fatty acid degradation enzyme gene encodes an acyl-CoA synthase. Preferred Microorganism: The genetically engineered microorganism is selected from a Gram-negative or a Gram-positive bacterium. It is genetically engineered to express, relative to a wild-type microorganism, (i) a decreased level of a gene encoding a fatty acid degradation enzyme, (ii) a decreased level of a thioesterase gene, (iii) a decreased level of a gene encoding an acyl-CoA dehydrogenase, and (iv) a decreased level of a gene encoding an outer membrane protein receptor. Preferred Composition: The composition has: (a) a cloud point of 5 degrees C or lower, preferably negative 4 degrees C or lower; (b) a simulated distillation T90 of 360 degrees C or lower, preferably 358 degrees C or lower; (c) a sulfur content of 15 ppm or less, preferably 10.7 ppm or less; (d) a Karl Fischer moisture content of 0.1 wt% or less, preferably 0.06 wt% or less; (e) a total acid number of 0.50 mg potassium hydroxide (KOH)/g or less, preferably 0.15 mg KOH/g or less; (f) a combined calcium and magnesium content of 5 ppm or less, preferably 0.5 ppm or less; (g) a combined sodium and potassium content of 5 ppm or less, preferably 1.6 ppm or less; (h) a specific mass at 20 degrees C of 850-900 kg/m3, preferably 870-880 kg/m3; (i) a kinematic viscosity at 40 degrees C of 3-6 mm2/second, preferably 3.5-4 mm2/second; (j) a water content of 500 mg/kg or less, preferably 450 mg/kg or less; (k) a total contamination level of 24 mg/kg or less, preferably 5 mg/kg or less; (l) a flash point of 100 degrees C or higher, preferably 120 degrees C or higher; (m) an ester content of 96.5 wt% or more, preferably 97 wt% or more; (n) a carbon residue number of 0.05 wt% or less; (o) a sulfated ash level of 0.02 wt% or less, preferably 0.01 wt% or less; (p) a phosphorus level of 10 mg/kg or less, preferably 1 mg/kg or less; (q) a copper corrosion score of 1; (r) a cold filter plugging point of 19 degrees C or lower, preferably 0 degrees C or lower; (s) a free glycerol level of 0.02 wt% or less; (t) a total glycerol level of 0.25 wt% or less, preferably 0.05 wt% or less; (u) a monoacylglycerol level of 0.02 wt% or less; (v) a methanol or ethanol level of 0.2 wt% or less, preferably 0.02 wt% or less; (w) an iodine number of 65 g/100 g or less; and (x) an oxidation stability at 110 degrees C of 6 hours or longer, preferably 11 hours or longer. EXAMPLE - No suitable example given.