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Effects of exogenous RA treatment at 2 dpp on 3-dpp RARE-hsplacZ whole testes and on isolated tubules stained for β-galactosidase activity are shown in (A) vehicle control of whole testis; (B) RA-treated whole testis; (C) vehicle control of isolated tubules; and (D) RA-treated isolated tubules (n = 3). Bars = 400 μm.
