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Cross-activity of retroviral proteases assayed on oligopeptide substrates representing naturally occurring cleavage sites. For simplicity, the kcat/Km values (mM−1s−1) were indicated as follows: < 0. 1: +; 0.1 – 1: ++; 1–10: +++; 10–100: ++++; > 100: +++++. Parenthesis indicates shift in the site of cleavage.
