Reports of decreased semen quality and increased rates of developmental abnormalities of the male reproductive tract along with increasing incidence of testicular cancer have focused attention on man-made chemicals as potential causative factors. A biologically plausible hypothesis has been advanced which suggests that man-made chemicals act as endocrine disruptors through interaction with the ...

The family Potamotrygonidae are the only species of stingrays restricted to fresh water and located exclusively in South America. objective this research was analyze morphological aspects germ cells male reproductive tract Potamotrygon amandae. samples were fixed 10% formalin, then dehydrated an ascending ethanol series (70 100%). To carry out light microscopy analyses, they embedded paraffin, ...

Paternal diet influences offspring metabolism, yet the underlying epigenetic mechanisms are unclear. Recently, Chen et al. (2016) and Sharma et al. (2016) identified tRNA fragments in sperm and the male reproductive tract as possible inherited factors altered by paternal diet that lead to gene misexpression and altered metabolism in offspring.