Figure 4

Cellular uptake of the FITC-MO in the rat oviduct. Photomicrographs of rat sections after 5 hours of intraoviductal injection of FITC-MO/Endo Porter mixture (A) or Endo-Porter alone (B). Note that arrows point strong green fluorescence representing cellular uptake of FITC-MO mainly in the luminal epithelium demonstrating penetration of MO in these cells in vivo. e = epithelium, sm = smooth muscle, L = lumen.