Fig. 3. Expression and distribution of SR-BI protein along the jejunal, ileal and colonic crypt-villus axis for 20 weeks of gestation. Representative indirect immunofluorescence micrographs of cryosections of human fetal jejunum (A), ileum (B), proximal colon (C) and distal colon (D). In all cases, no fluorescent staining was observed when the primary SR-BI antibody was replaced with the appropriate nonimmune serial (data not shown). Bars, 50 µm.