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The capsid of Escherichia coli bacteriophage HK97 assembles as a 420 subunit icosahedral shell called Prohead I which undergoes a series of maturation steps, including proteolytic cleavage, conformational rearrangements, and covalent cross-linking among all the subunits to yield the highly stable mature Head II shell. Prohead I have been shown to assemble from pre-formed hexamers and pentamers of...
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