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Virions of some of the RT mutants contain degraded RT; IN and PR are processed normally and are present in normal amounts. The blots are from the same filter probed sequentially with four antisera. (A) Western blots of RT mutants probed with anti-RT sera. (B) The same blots probed with anti-IN. (C) Probed with anti-PR. (D) Probed with anti-CA.
