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(A) Sector of the germinal epithelium in the seminiferous tubule. Drawing on the basis of a semithin section. × 900 (B) Sertoli cells divide the germinal epithelium in a basal and adluminal compartment. Arrows indicate the transport of substances only to the basal compartment, via the Sertoli cell into the adluminal compartment, via the Sertoli cell into the lumen.
