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Fig. 2. Log10-transformed plasma testosterone (T) concentration vs snout–vent length (SVL) for natural yearling males (open symbols) and females (filled symbols) of (A) Sceloporus virgatus and (B) S. jarrovii, during the mating season. Least-squares regression lines are shown for males of each species: (A) y=8.92x–13.69; (B) y=6.07x–9.44. See text for statistical analyses.