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Activities of different species' proteasomes for individual peptides organized according to P1 (alphabetical order, color-coded) and within each set with the same P1, by P2. Each dot represents one substrate that is color-coded by its P1 amino acid. a, Mtb20SWT; b, Mtb20SOG; c, Rhod20S; d, bov20S; B, citrulline; O, ornithine. The labeled substrates are all in the order (from left to right) of P3-P2-P1 in sequence, and color-coded as green with black border.
