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Binding of M-specific MAbs to the virus surface. (A) Western blot analysis of the heavy and light antibody chains from MAbs specifically bound to the virion surface. IgG, purified immunoglobulin G. + NP-40 or − NP-40, presence or absence of NP-40 in virus preparations. (B) Western blot analysis of the heavy and light chains of the M-specific MAbs bound to the surfaces of purified virions (V) and their cores (C). Heavy (H) and light (L) immunoglobulin chains are indicated by arrows.
