Cytosolic phosphoglycerate mutase dimer catalyzes the reversible isomerisation of 2- and 3-phosphoglycerate. There are two isoforms of this enzyme, PGAM1 (isoform B) and PGAM2 (isoform M). In the body, erythrocytes express only PGAM1, while skeletal muscle expresses only PGAM2. Other tissues express both isoforms (Repiso et al. 2005; Tsujino et al. 1993).