| Green - Spermtagonia near suface of tubule. | Orange -Primary spermatocyte with granular nucleus. |
| Black - Sertoli cell with a triangular shaped nucleus. | Blue - Secondary spermatocyte near lumen. |
| Purple - Spermatozoa - elongated small nucleus. | Note - Spermatogenesis proceeds from the surface of the tubule to the lumen. |
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