Fig. 4
![Fig. 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12906-017-1588-4/MediaObjects/12906_2017_1588_Fig4_HTML.gif)
Immunostaining of neuronal nitric oxide synthase (nNOS) in the dorsal penile nerve. a, b, c Immunostaining for nNOS (red - white arrow) and β-III tubulin (green) in the dorsal penile nerve. Magnification: x400. d Mean intensity of nNOS expression for the dorsal penile nerve cross section. Data are expressed as mean ± SD. * Significant difference between the control and high fat and cholesterol diet (HFC) groups. ** Significant difference between the HFC and HFC + KH groups