Phosphoglycerate mutase-like protein lacking PGM activity, but having a low metal-independent phosphoserine phosphatase activity in vitro. May be involved in serine biosynthesis. H2O + O-phospho-L-serine = L-serine + phosphate H2O + O-phospho-D-serine = D-serine + phosphate Measured in a reaction mixture containing 1 mM EDTA and no magnesium. Belongs to the phosphoglycerate mutase family. The full-length coding region has been amplified by RT-PCR and sequenced, but not submitted to the EMBL/GenBank/DDBJ databases. Truncated N-terminus.