heterologous

adj. of or taken from a different species

In medicine a heterologous transplant means 'between species' or 'from one species to another'.In protein quaternary structure a heterologous interface is a subunit-subunit interface which occurs between different sequence regions of the protein subunit. All hetero-oligomeric interfaces are heterologous by definition, occurring between different subunits. However, homo-oligomeric interfaces are only rarely heterologous. In contrast, homo-oligomers tend to have isologous interfaces.
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Adjective
1. not corresponding in structure or evolutionary origin
(synonym) heterologic, heterological
(antonym) analogous
(classification) biology, biological science
2. derived from organisms of a different but related species; "a heterologous graft"
(antonym) autologous

(a.)
Characterized by heterology; consisting of different elements, or of like elements in different proportions; different; -- opposed to homologous; as, heterologous organs.
  

referring to certain cells and antisera derived from a different individual or species, one immunologically related but not identical (a heterologous skin graft, for example, would not come directly from its own recipient).