Isolation of progenitor cells from human fetal pancreatic tissue. (A and B) The histological feature of human fetal pancreas at the 11th gestational week was immunochemistry stained for CD133 (A) and insulin (B). (C) Islet-like structures isolated from human fetal pancreas. (D) Progenitor cells grew out from the islet-like structures after 24 hours of culture. The progenitor cells exhibited epithelial-like morphology.