Virions of polyvalent staphylococcal bacteriophage SB-I have an octaedric head (800 X 700 A) and a long contractive process (1800 X 150 A). The phage particle with a molecular weight of 150 X 10(6) daltons contains 48% double-stranded RNA and 52% protein. The proteinic component of the phage consists of 18 heterogeneic polypeptide chains.
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