in solution the forward ( kf ) and reverse ( kr ) pseudo-first-order rate constants for the ck reaction ( kf = k1 [ mgadp ] [ h+ ] ; kr = k-1 [ creatine ] ) as well as the concentrations of phosphocreatine ( pcr ) , mgatp , and creatine ( cr ) remained constant between ph 6.9 and ph 7.8 .
C0031634
phosphocreatine
C0010286
creatine