Strain (biology)

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In biology, strain is used in three related ways.


A strain is a genetic variant or subtype of a virus or bacterium. For example, a "flu strain" is a certain biological form of the influenza or "flu" virus. Compare clade.


A strain is a group of plants with similar (but not identical) appearance and/or properties. The term has no official status. See cultivar.


A mouse or a rat strain is a group of animals that is genetically uniform. Strains are used in laboratory experiments. Mouse strains can be inbred, mutated or genetically engineered, while rat strains are usually inbred.

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