Blocked alpha-amino groups in peptides due to diketopiperazine formation.

Alcohol Oxidoreductases Amino Acid Sequence Amino Acids/analysis Carbon Radioisotopes Chromatography, Gel Chromatography, Paper Chromatography, Thin Layer Chymotrypsin Dansyl Compounds Electrophoresis, Paper Hydrogen-Ion Concentration Iodoacetates Ketones Peptide Fragments/analysis Peptides Piperazines Saccharomyces cerevisiae/enzymology Trypsin

Amino Acids Carbon Radioisotopes Dansyl Compounds Iodoacetates Ketones Peptide Fragments Peptides Piperazines Alcohol Oxidoreductases Chymotrypsin Trypsin