PhzC/PhzF is involved in dimerization of two 2,3-dihydro-3-oxo-anthranilic acid molecules to create PCA by P. fluorescens. This family also contains Swiss:P28176, though there is no significant sequence similarity to pfam00303 members. This family appears to be distantly related to pfam01678, including containing a weak internal duplication. However members of this family do not contain the conserved cysteines that are hypothesized to be active site residues (Bateman A pers obs).