- In biology or zoology, denoting organs or parts corresponding in evolutionary origin and similar to some extent in structure, but not necessarily similar in function.
- In chemistry, denoting a single chemical series, differing by fixed increments.
- In genetics, denoting chromosomes or chromosome parts identical with respect to their construction and genetic content.
- In immunology, denoting serum or tissue derived from members of a single species, or an antibody with respect to the antigen that produced it.
- Proteins having identical or similar functions (particularly with respect to proteins from different species).
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Examples: glitazone, GI cocktail, etc.