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(A) Histology of the Leydig cell areas and STs of breeding and nonbreeding male NMRs. (B–E) Quantification of the Leydig cell area/ST area ratio (P = 0.0006670), ST areas (P = 0.003640), ST thickness (P = 0.0007127), and ST diameters (P = 0.003640) (n = 6 in each group). Scale bars = 20 μm. Data are presented as means ± SEM.
