Bisphosphoglycerate mutase (EC 5.4.2.4) (2,3-bisphosphoglycerate mutase, erythrocyte) (2,3-bisphosphoglycerate synthase) (BPGM) (EC 5.4.2.1) (EC 3.1.3.13) (BPG-dependent PGAM); Plays a major role in regulating hemoglobin oxygen affinity as a consequence of controlling 2,3-BPG concentration. Can also catalyze the reaction of EC 5.4.2.1 (mutase) and EC 3.1.3.13 (phosphatase), but with a reduced activity (By similarity) (259 aa)