the present paper reports that tcbp , which has two high affinity ca2+-binding sites ( kd=4.6 x 10 ( -6 ) m ) , could activate porcine brain cyclic nucleotide phosphodiesterase at a concentration of over 10 ( -6 ) m free ca2+ , with the same mode of activation as that of authentic ( porcine brain ) calmodulin .
C0086045
concentration
C0006104
brain