xenogeneic
Concise Oxford English Dictionary © 2008 Oxford University Press:
xenogeneic /ˌzɛnə(ʊ)dʒɪˈniːɪk, -ˈneɪɪk/
▶adjective Physiology relating to or denoting immunologically incompatible tissues which belong to individuals of different species.
'xenogeneic' also found in these Oxford entries:

