Abstract
H (heavy) and L (light) MS-2 particles differ in density, absorption spectrum, and infectivity. Studies on their sedimentation, ribonucleic acid (RNA) content and infectivity, appearance under the electron microscope, ribonuclease sensitivity, and A-protein content failed to demonstrate any difference between the two particle types. Studies on the size, RNA content, and density of the capsid and two smaller coat protein components were also conducted. The antigenic relatedness of five different viral and subviral particles of MS-2 were studied by using immunodiffusion and neutralization. Capsids and the H and L viral particles were shown to be antigenically related, whereas the coat protein monomers and dimers were shown to be unrelated to the higher-molecular-weight particles.
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