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:''This article is about biological strains. For other meanings, see strain.''
In biology, '''strain''' is used in three related ways.
==Microbiology/Virology==
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.
==Plants==
A 'strain' is a group of plants with similar (but not identical) appearance and/or properties. The term has no official status. See cultivar.
== Rodents ==
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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External links

External links

★ International Mouse Strain Resource (IMSR)

★ Rat strain index