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Colocalization of AChRs and other postsynaptic markers in aneural myotubes cultured on laminin. Myotubes were double stained with Btx (A–E) and antibodies to rapsyn (A′), phosphotyrosine (B′), laminin β2 (C′), laminin α5 (D′), or laminin γ1 (E′). Bar, 20 μm for all panels.
