(a) Changes in rat weights. #: significant differences versus control. *, **, ***: significant differences versus first weights. (b) Johnson’s testicular biopsy score. *: significant decrease versus control. **: significant increase versus stress. (c) Changes in diameter of seminiferous tubules. *: significant decrease versus control. **: significant increase versus stress. (d) Changes in thickness of basement membrane. *: significant increase versus control. (e) Number of TUNEL (+) cells. *: significant increase versus control. **: significant decrease versus stress. (f) Number of Active Caspase-3 (+) cells. *: significant increase versus control. **: significant decrease versus stress.