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A protease with broad substrate specificity usually produces a complex peptide mixture. However, even-numbered peptides were obtained at high proportion upon papain hydrolysis of fibroin composed of highly repetitive Ala- and Gly-rich blocks. MALDI-TOF and ESI mass spectrometric analysis revealed that the even-numbered peptides were in the forms of di-, tetra-, hexa-, and octa-peptides with repeating...
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