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Protein tyrosine phosphorylation of substrates around 55–59 kDa is induced on human monocytes with different CD38 mAbs. Purified monocytes were either unstimulated or stimulated with the indicated mAbs. Cells were then lysed and subjected to SDS/PAGE before transferring to nitrocellulose membranes and immunoblotting with antiphosphotyrosine mAb. The same quantity of protein was loaded in each well. Molecular mass markers are indicated.
