Neanderthals more likely to have O blood type?

Several interesting consequences if borne out, including this one that observes O type blood suggests long isolations for certain types of disease.

Neanderthals might have made good blood donors - life - 09 January 2009 - New Scientist

"It is interesting that Neanderthals have a high O frequency, because the other group with a high O frequency today is native Americans," Hawks says. "They're not closely related, but they may have experienced similar environments to the extent that they might have been isolated from diseases that came from Africa and South Asia."