Time-course of proteolysis and quantitative analysis of protein cleavage products formed during digestion of rP172 by rpMmp-20. (A) Based on the full-length porcine amelogenin, proteolytic products were designated: I, 2-173 (rP172); II, 2-162; III, 2-148; IV, 46-148 (13k); V, 64-148 (11k), VI, 2-63 (extended TRAP); VII, 2-45 (TRAP); (B) The quantity of proteolytic products corresponding to the stained bands in A is plotted against the proteolytic time in hours as analyzed by Image J.