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Representative photomicrographs of testes from control and NDMA-treated rats. Control testes (A) showed normal morphology. Treatment-related lesions such as mild congestion, degeneration of the seminiferous tubules and distortion in the testes of NDMA-treated rats (C) were reduced in [NDMA+BA]-treated rats (D), while photomicrographs from BA-treated rats (B) appeared similar to the control (A). BA: betulinic acid; NDMA: N-nitrosodimethylamine.
