The specific claims are totally different if you look at claim section. In US, the patent# 6,685,941 was granted to RGEN in 2004. It is a done deal. In EU, there are still battles going on as to which claim is valid. However, UMICH EU claim is much broader than UC counterpart (including organ transplant). Now, on that account, even BMS's Belatacept is in trouble, not to mention Abatacept.