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• a  not corresponding in structure or evolutionary origin
• a  derived from organisms of a different but related species
  a heterologous graft

• heterologic
• heterological

• analogous
• autologous

Quotes

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• Robert Gallo in Washington Post
  What you want to do is have evidence in primates that you can block completely, or nearly completely, a challenge with at least one, if not two or three challenges with heterologous [varied] strains of virus,said US AIDS pioneer Dr. Robert...