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Residues occupying the P1-P4 positions in peptides released from type I collagen following digestion by FhCL2 and FhCL3 as determined by LC-MS/MS analysis of digest samples (see Fig. 2). The frequency by which amino acids occur at the P1-P4 positions of collagen α1 and α2 chains (converted to a percentage of the total) are plotted for the 18 h reactions shown in Fig. 1B.
