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Proteomic identification of altered proteins during skeletal muscle aging. Shown is a representative 2D mastergel of proteins with differential expression in aged rat gastrocnemius muscle. Identified protein spots are numbered 1–6 and their mass spectrometric identification is listed in Table I. The pH-values of the first dimension gel system and molecular mass standards (in kDa) of the second dimension are indicated on the top and on the left of the panels, respectively.
