Source:http://linkedlifedata.com/resource/umls/id/C0018358
MSH: An enzyme that catalyzes the conversion of GTP to 3',5'-cyclic GMP and pyrophosphate. It also acts on ITP and dGTP. (From Enzyme Nomenclature, 1992) EC 4.6.1.2.,NCI: Guanylate cyclase (GC) is an enzyme that converts GTP to the second messenger cyclic GMP (cGMP). There are two forms: plasma membrane GCs that are receptors for hormones, and intracellular soluble GCs that are activated by the gaseous second messenger nitric oxide (NO). EC 4.6.1.2