Menaquinone 9 (MK-9) is a vitamin K2 analog that has been found in various bacteria, including E. coli. MK-9 is UV-sensitive and binds to soluble nitrate reductase, a component of the bacterial electron transport chain. In vivo, MK-9 increases plasma prothrombin concentration in vitamin K-deficient rats.
MK-912 is a potent novel selective alpha2-adrenergic receptor antagonist with oral activity to study the effect of short-term selective alpha2-blockers on fasting glucose (FPG) and islet function in non-insulin-dependent patients with diabetes mellitus (N
MK-9470 is a selective, high-affinity reverse agonist and is also a fluorine 18 labeled positron emission tomography (PET) radiotracer [(18) F]. The MK-9470 has been used to image cannabinoid receptor type 1 in healthy and ill human brains.