Penile tissue sections were prepared as aforementioned and adjacent tissue sections were used for: (a) Masson trichrome staining for collagen (blue) and smooth muscle cell (red) (Muto Pure Chemicals, Tokyo, Japan); (b) immunodetection with: (i) polyclonal antibody against iNOS (Calbiochem, La Jolla, CA, USA); (ii) rabbit polyclonal anti-eNOS IgG antibody against eNOS (Santa Cruz Biotechnology, Santa Cruz, California, USA). All the staining procedure were carried out according to the manufacturer’s instructions.
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