Abstract
Long-tailed azotophages of two different serological groups have deoxyribonucleic acid species whose densities correspond to a molar percentage of guanine plus cytosine of 52 to 53. Similar measurements on the short-tailed phages gave values of 56 to 57 moles percent. The azotophages include representatives of the three morphological types classified by Bradley as groups A, B, and C.
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