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When glycylphenylalanine and phenylalanylglycine were irradiated on thin layers of silica gel G, peptide bond fission, diketopiperazine formation and deamination occured. The products were identified by thin‐layer chromatogrpahy on the same plate, procedure which enables very small quantities of material to be irradiated.
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Rivett et al. (1967) studied this question.
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