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Morphology (A and B) and immunolocalization of αSMA (C and D) in cycling baboons treated with hCG. Note the distinct epithelial plaques that are associated with the luminal epithelium (arrow; A) and the localization of αSMA in stromal fibroblasts below the plaques (St; C) in hCG-treated animals. The controls treated with heat-inactivated CG showed no response in either of the two cell types (B and D). [Final magnification ×77 (A and B) and ×45 (C and D).]
