by using the techniques of in vivo radiolabeling and sequential high-performance liquid chromatographic purification coupled with chemical modification , the biosynthesis of six radiolabeled [ met ] enkephalin-containing peptides -- [ met5 ] enkephalin , [ met5 , arg6 , gly7 , leu8 ] enkephalin , [ met5 , arg6 , phe7 ] enkephalin , metorphamide , peptide e , and bam 18p -- was followed .
C0014295
met ] enkephalin
C0014298
enkephalin