because cyclic gmp and testosterone seem to have similar actions , the objective of this investigation was to determine if testosterone and its precursors might have part of their mechanism of action through stimulation of guanylate cyclase [ gtp pyrophosphate-lyase ( cyclizing ) , ec 4.6.1.2 ] , the enzyme that catalyzes the formation of cyclic gmp from gtp .
C0018358
guanylate cyclase
C0024188
lyase