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Immunochemical staining of PI31 localisation in wild type testes. Roman numerals indicate tubule stage. PI31 signal is cytoplasmic in Spc/M/RB/L but nuclear in ES and early CS. Key: SpC = spermatocyte, ES = elongating spermatid, CS = early condensing spermatid, M = mature or late condensing spermatid, RB = residual body, L = Leydig cell, S = Sertoli cell, F = flagellum of mature sperm.
