Fluorescence micrographs of rat uteri after intrauterine administration of FITC-ODNs. (A) The uterine horn treated with FITC- ODNs (either sense or antisense) displaying high level of fluorescence only in the luminal epithelium 2.5 hours after administration. (B) 48 hours later, a moderate fluorescence in the stromal compartment was observed after treatment with FITC- ODNs (either sense or antisense). (C) Uterine horn treated with unlabeled control A-ODNs displaying no fluorescence. le, luminal epithelium; s, stroma. Bar = 100 μm.