. . . . "Phosphorylated by PRKG1/cGKI-beta; Ser-367 showed constitutive phosphorylation in platelets Whereas Ser-657 is only phosphorylated in presence of cGMP and nitric oxide (NO); Ser-670 is phosphorylated in resting platelets but increases in presence of cGMP and NO. PRKG1 inhibitor prevents phosphorylation of Ser-657 and Ser-670 in response to NO and cGMP." .