- A group of two or more people united by blood, adoptive, or marital ties, or the common law equivalent.
- In biologic classification, a taxonomic grouping at the level intermediate between the order and the tribe or genus.
- A group of substances closely related structurally.
- A group of proteins with characteristic sequence, pharmacologic, and/or signaling profiles.
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Examples: glitazone, GI cocktail, etc.