it is shown that , in the biosynthesis of ergosterol from [ 26,27- ( 14 ) c ( 2 ) ,23- ( 3 ) h ( 2 ) ] lanosterol by the whole cells of saccharomyces cerevisiae , one of the original c-23 hydrogen atoms is lost and the other is retained at c-23 of ergosterol .
C0011744
h ( 2
C0020275
hydrogen