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Immunoprecipitation of p140 autoantigens. The autoradiogram shows the results of 10% sodium dodecyl sulfate–polyacrylamide gel electrophoresis of immunoprecipitates of 35S-methionine–labeled K562 cell extracts, using normal serum (lane 1), anti-p155/140–positive juvenile dermatomyositis (DM) serum (lane 2), and different anti-p140–positive juvenile DM sera (lanes 3–14).
