allogeneic vs heterologous

allogeneic

adj
  • Genetically different because of being derived from separate individuals of the same species. 

  • Of a reaction that occurs when cells are transplanted into a genetically different recipient. 

heterologous

adj
  • Of, or relating to different species 

  • Having different relationships or different elements 

How often have the words allogeneic and heterologous occurred in a corpus of books? (source: Google Ngram Viewer )