<p>This entry represents a group of proteins based on a Pfam B protein family. The protein PfaB family is part of a four-gene locus, which is similar to polyketide biosynthesis systems, responsible for omega-3 polyunsaturated fatty acid biosynthesis in several high pressure and/or cold-adapted bacteria. The fairly permissive trusted cut off set for this HMM allows detection of homologues encoded near homologues to other proteins of the locus: PfaA, PfaC, and/or PfaD. The likely role in every case is either polyunsaturated fatty acid or polyketide biosynthesis.</p>