Comparison of chemokine receptor expression in PBMCs and uterine cervix. CCR5 mRNA expression in the cervix was 10-fold greater than CXCR4, 20-fold greater than CCR2b, and 100-fold greater than CCR3. In PBMCs, CXCR4 expression was 1.5-fold greater than CCR5, 10-fold greater than CCR2b, and 15-fold greater than CCR3. US28 was not expressed in any of the cervical biopsies despite expression in PBMCs from five individuals.