Figure 4From: Failure to respond to endogenous or exogenous melatonin may cause nonphotoresponsiveness in Harlan Sprague Dawley rats Mean (+/- SEM) of body mass (a), paired testis mass (b), and paired seminal vesicle mass (c) of young HSD rats held in SD or constant dark (24D). Sample sizes: n = 13 in SD and 11 in 24D. NS indicates a lack of significant differences.Back to article page