the effects of mutations occurring at three independent loci , eth2 , eth3 , and eth10 , were studied on the basis of several criteria : level of resistance towards two methionine analogues ( ethionine and selenomethionine ) , pool sizes of free methionine and s-adenosyl methionine ( sam ) under different growth conditions , and susceptibility towards methionine-mediated repression and sam-mediated repression of some enzymes involved in methionine biosynthesis ( met group i enzymes ) .
C0036584
selenomethionine
C0025646
methionine