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Examples of seminiferous tubules from reindeer testes representing various stages of spermatogenesis as defined in Table 1. (A) The seminiferous tubule circled I is an example of a tubule ranked 0; (B) the seminiferous tubule labeled II is an example of a tubule ranked 1; the seminiferous tubule labeled III is an example of a tubule ranked 3; (C) the seminiferous tubule in the middle is an example of a tubule with mature sperm (6µ H&E).
