English: Diagram 1- Testosterone, shown in this image as T, outside of a cell containing androgen receptors and 5a-reductase (5a-r), an enzyme which converts T to DHT. AR stands for androgen receptor, which binds to both T and DHT.
Diagram 2 - Testosterone (T) inside the cell, going one of two pathways, shown by numerals I and II.
(I) T does not bind to the enzyme 5a-reductase (5a-R) and simply binds to the androgen receptor (AR), where it will later be transported into the nucleus.
(II) T binds with the enzyme 5a-R, becoming DHT (indicated by the descending arrow). From there, DHT binds to the AR and will be transported to the nucleus.
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