<p>This group of sequences belong to the IB subfamily of the haloacid dehalogenase (HAD) superfamily of aspartate-nucleophile hydrolases. The sequences are all bacterial. The IB subfamily includes the enzyme phosphoserine phosphatase. Due to this relationship, several of these sequences have been annotated as "phosphoserine phosphatase related proteins," or "phosphoserine phosphatase-family enzymes." There is presently no evidence that any of the proteins in this family possess PSPase activity. </p>