CXCL12 and CXCR4 mRNA is upregulated in conceptuses during early gestation. CXCL12 (A) and CXCR4 (B) mRNA are significantly (P < 0.05) upregulated in ovine conceptuses on Day 21 compared to earlier days collected. Both CXCL12 and CXCR4 transcripts are also significantly (P < 0.05) upregulated on Day 30 of pregnancy compared to Days 13, 15, 16, 17, and 21. Data are represented by graphing 2-ΔCt values, where ΔCt indicates GAPDH normalized Ct values. Data represent the mean ± SEM.