BACTERIAL VIRUS. “HK97 is a bacterial virus, bacteriophage, known to infect Escherichia coli and related bacteria. The capsid protein of HK97, gp5, cross-links upon maturation to form a concatenated chain-mail like structure. The bacteriophage undergoes a maturation process upon DNA packaging during which it expands by nearly 5 nm and changes from spherically symmetrical to icosahedrally symmetrical.”
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