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Two-dimensional electrophoresis with silver stain of plasma IgM purified from plasmapheresis eluates of a patient with both anti-actin and anti-ATP synthase antibodies. This analysis shows a high degree of purity of infused IgM, mainly consisting in heavy (µ), intermediate (µs) and light chains (kλ). Groups of proteins with anionic pIs and MW between 60 and 10 kD represent a minor fraction (10%) of this preparation.
