Figure 2From: Aromatase expression and role of estrogens in male gonad : a reviewHuman spermatozoa : source and targets of estrogens. It has been shown that human ejaculated spermatozoa contain aromatase as revealed by the mRNA, protein on Western blots and the presence of endogenous estradiol. As far as estrogen receptors are concerned mainly ER alpha are present.Back to article page