source? thank you
Here you go for starters:
http://www.academia.edu/3138607/Morphological_and_Biochemical_Changes_in_Male_Rats_Fed_on_Genetically_Modified_Corn_Ajeeb_YG_
http://www.ijbs.com/v05p0706.htm#headingA11
http://onlinelibrary.wiley.com/doi/10.1002/jat.2712/abstract
http://www.ncbi.nlm.nih.gov/pubmed/21338670