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Relationship between MDR1 expression and expression of CXCR4 mRNA in PBMC isolated from healthy volunteers. Transcripts were quantified by real-time reverse transcription-PCR, and statistical analysis was carried out by Spearman's rank correlation. A statistically significant correlation was observed between MDR1 and CXCR4 (n = 21; rho = 0.61; P < 0.005).
