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The tail baseplate of bacteriophage T4 contains a structurally essential, three-domain protein encoded by gene 5 in which the middle domain possesses lysozyme activity. The gene 5 product (gp5) undergoes post-translational cleavage, allowing the resultant N-terminal domain (gp5 * ) to assemble into the baseplate as a trimer. The lysozyme activity of the undissociated cleaved gp5 is inhibited...