penile arterial endothelium has a lower glutathione level Diabetes India Erectile Dysfunction and Oxidative Stress:
Description
Glutathion: the king of metabolism

213 , 813 (1955) Srivastava, S.K., Beutler, E.: Accurate measurement of oxidized glutathione content of human, rabbit, and rat red blood cells and tissues

The binding sites of the protein substrates are obviously located in transmembrane domains or directly under the membrane [13]

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