Board Thread:General Discussion/@comment-5977816-20140204224102/@comment-5111452-20140206021158

No, it just says he has it. I'm guessing he had a DNA mix or something in his genes, but since it doesn't lead to any failure in his fighting, I guess the Kaminoans just left it. BTW, if any of you guys are wondering, the book is Star Wars: The Clone Wars: New Battlefronts.