Abstract
Fraction B of oxidized insulin was subjected to hydrolysis by pepsin, trypsin and chymotrypsin. The resulting peptides were fractionated by paper chromatography and their structure investigated. It was concluded that the structure of the phenylalanyl chains of insulin is phenylalanine.valine.aspartic acid(-NH2).glutamic acid(-NH2). histidine.leucine.cysteic acid.glycine.serine.histidine.leucine. valine.glutamic acid.alanine.leucine.tyrosine.leucine.valine. cysteic acid.glycine.glutamic acid.arginine.glycine.phenylalanine. phenylalanine.tyrosine.threonine.proline.lysine.alanine.