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Proportion of chemokine (C-C motif) receptor 5 (CCR5) molecules expressed by T4 cells that are present at the cell surface in patients with rheumatoid arthritis (RA) as compared with healthy donors. This proportion was calculated from the ratio of the mean number of CCR5 molecules detected on non-permeabilized T4 cells to the mean number of CCR5 molecules detected in and on permeabilized T4 cells by quantitative flow cytometry.
