Immunohistochemical localization of ALDH1 in normal ovaries. [A-B] Intense staining of numerous cells of stroma (S) and surface epithelial cells (SE) was observed in normal ovary. Insets showing examples of ALDH1 stained stromal and epithelial cells and an example of an occasional unstained epithelial cell at high magnification (×1000). [C] ALDH1 staining was absent in smooth muscle cells (SMC; dotted outline) surrounding blood vessel (BV) and [D] in the granulosa cell layer (black arrow) lining follicles (F). However, the theca layer (dotted arrow) and neighboring stromal cells (S) expressed ALDH1. [E-F] Representative images of ALDH1 stained cells (arrow; fibroblast like cells) within the corpus albicans (CA). Sections were counterstained with hematoxylin. (Original magnifications: ×200, ×400, ×400, ×400, ×100 and ×400 respectively).