Characterisation of the isoenzymes of phosphoglucomutase (PGM) determined by the first (PGM1) and second (PGM2) locus observed by isoelectric focusing

Summary The existence of four alleles of phosphoglucomutase (PGM₁) in human red cell lysates has previously been demonstrated by isoelectric focusing (Bark et al., 1976; Kühnl et al., 1977; Sutton and Burgess, 1978). Experiments are now described in which the position of each of the first-locus (PGM₁) and second-locus (PGM₂) isoenzymes is defined, thus extending and confirming the original proposal made by Bark et al.