after overnight exposure of segments to 9 muml-methionine-u- ( 14 ) c , the specific radioactivity of the ethylene evolved by untreated and wounded tissue was determined and compared to the specific radioactivities of carbon atoms 3 plus 4 of methionine and s-methylmethionine ( smm ) extracted from the segments .
C0025646
methionine
C0042889
methylmethionine