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Immunolabeling of muscle from patient 5 showing absence of labeling with the SH3 antibody in longitudinal and transverse orientation (a) but positive labeling with the M176–M181 antibody (b). Labeling is enhanced in the small fibers expressing slow myosin (c), but the larger fibers are not completely negative and show uneven labeling (arrow). (Bar = 50 μm.)
