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The internal symmetry of the connector or portal particle from the double-stranded DNA bacteriophage φ29 has been examined by X-ray crystallography. This large multimeric structure (420 kDa) is built up by a number of identical subunits of the p10 protein. It connects the head of the virus with the tail and plays a central role in the prohead assembly and DNA packaging. For the first time a bacteriophage...
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