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Individual germ cell volume in control, propylthiouracil PTU- and T3-treated mice killed between 5 and 100 days of age. Different letters for the same age denote significant differences (P < 0.05) between groups. Undifferentiated type A (Aund), differentiated type A (A1–4), intermediate (In) and type B (B) spermatogonia (mean ± SEM). Different letters for the same age germ cell type indicate significant differences (P < 0.05).
