NOVELTY - Degrading biomass or pretreated biomass to sugars, where an enzyme is used comprising a polypeptide having cellulase enhancing activity.    USE - The method and enzyme described above are used for degrading biomass or pretreated biomass to sugars (claimed). The novel cell wall deconstruction enzymes are used in several industrial applications, for example in food applications, such as for example cereal-based food products, in the textile industry for the treatment of cellulose-based fabrics; in the feed-enzyme industry such as for example increasing the digestibility of nutrients; in the pulp and paper industry such as enhancing bleachability of the pulp; in the waste treatment industry for the decolorization of synthetic dyes; and in the bioethanol industry such as for example improving the ethanol yield and increasing the efficiency and economy of ethanol production.    ADVANTAGE - Improved enzymes for feed and food processing applications are provided.    DETAILED DESCRIPTION - Degrading biomass or pretreated biomass to sugars, where an enzyme is used comprising a polypeptide having (i) a polypeptide sequence selected from SEQ ID Nos: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39 and 42; (ii) a polypeptide that is at least 60%, preferably at least 70%, more preferably at least 80%, even more preferably at least 90-99% homologous to the any one of SEQ ID Nos: 3,6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39 and 42; (iii) a polypeptide sequence encoded by nucleic acids sequence selected from SEQ ID NOs: 1, 2, 4, 5, 7, 8, 10, 11, 13, 14, 16, 17, 19, 20, 22, 23, 25, 26, 28, 29, 31, 32, 34, 35, 37, 38,40 and 41, or nucleic acids that are at least 60%, preferably at least 70%, more preferably at least 80%, even more preferably at least 90-99% homologous to any one of SEQ ID NOs: 1, 2, 4, 5, 7, 8, 10, 11, 13, 14, 16, 17, 19, 20, 22, 23, 25, 26, 28, 29, 31, 32, 34, 35, 37, 38, 40 and 41; (iv) a polypeptide sequence encoded by a nucleic acids sequence hybridizing under stringent conditions to the polynucleotide selected from SEQ ID NOs: 1, 2, 4, 5, 7, 8, 10, 11, 13, 14, 16, 17, 19, 20, 22, 23, 25, 26, 28, 29, 31, 32, 34, 35, 37, 38, 40 and 41; or (v) a polypeptide sequence encoded by a nucleic acids sequence hybridizing under stringent conditions to the reverse complement of a polynucleotide selected from SEQ ID NOs: 1, 2, 4, 5, 7, 8, 10, 11, 13, 14, 16, 17, 19, 20, 22, 23, 25, 26, 28, 29, 31, 32, 34, 35, 37, 38, 40 and 41. Sequences not defined here may be found at ftp://ftp.wipo.int/pub/published_pct_sequences/publication.