Aromatase is abundantly expressed by neonatal rat penis but downregulated in adulthood.

@article{Jesmin2004AromataseIA,
  title={Aromatase is abundantly expressed by neonatal rat penis but downregulated in adulthood.},
  author={Subrina Jesmin and Chishimba Nathan Mowa and Ichiro Sakuma and Naoyuki Matsuda and Hiroko Togashi and Mitsuhiro Yoshioka and Yuichi Hattori and Akira Kitabatake},
  journal={Journal of molecular endocrinology},
  year={2004},
  volume={33 2},
  pages={
          343-59
        }
}
Although synthesis of estrogen by male gonads has been well documented for over half a century, it is only recently that the role of estrogen in male reproductive events has gained appreciation. We recently reported abundant expression of estrogen receptor (ER)-alpha and -beta in different cell types of the rat penis, whose levels diminished with advancing age. The present study, which builds on data from the ER study, was designed to determine whether the penis is capable of generating its own… 

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