title: Semisynthesis of a des(1-21)-preproinsulin derivative.
mesh_terms: D000595:Amino Acid Sequence; D000596:Amino Acids / Q000032:analysis; D000818:Animals; D002417:Cattle; D008722:Methods; D011384:Proinsulin / Q000031:analogs & derivatives* / Q000138:chemical synthesis; D011498:Protein Precursors
chemical_list: D000596:Amino Acids; D011498:Protein Precursors; D011384:Proinsulin