the final step in a scheme for the purification of the guanine nucleotide- and mg2+-binding stimulatory regulatory component ( ns ) of adenylyl cyclase [ adenylate cyclase ; atp pyrophosphate-lyase ( cyclizing ) , ec 4.6.1.1 ] from human erythrocyte membranes involves chromatography over hydroxylapatite ( hap ) which yields two fractions .
C1382029
atp pyrophosphate-lyase
C0086418
human