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The concept of '''model species''' or '''model organism''' refers to biological species used in biomedical research to exemplarily elucidate biological processes, especially at the molecular and cellular levels. It is widely studied, usually since it is easy to maintain and breed in a laboratory setting and has particular experimental advantages. They often have smaller genomes compared to their close relatives and recently many of them have been sequenced by genome projects. Some examples of model species include the bacterium ''Escherichia coli'', the  nematode worm ''Caenorhabditis elegans'', the fruit fly ''Drosophila melanogaster'', the mouse ''Mus musculus'', the zebra fish ''Danio rerio'' and the flowering plant ''Arabidopsis thaliana''.
{{Image|D. melanogaster.jpg|right|350px|Male fruit fly.}}
The concept of a '''model organism''' or '''model species''' refers to [[species (biology)|biological species]] used in [[biomedical|biomedicine]] research to exemplarily elucidate [[life|biological processes]], especially at the [[Molecular biology|molecular]] and [[Cell biology|cellular]] levels. It is widely studied, usually since it is easy to maintain and [[breeding|breed]] in a [[laboratory]] setting and has particular [[experiment]]al advantages. They often have smaller [[genome]]s compared to their close relatives and recently many of them have been sequenced by genome projects. Some examples of model species include the bacterium ''[[Escherichia coli]]'', the  nematode worm ''[[Caenorhabditis elegans]]'', the fruit fly ''[[Drosophila melanogaster]]'', the zebra fish ''[[Danio rerio]]'', the frog ''[[Xenopus laevis]]'', the mouse ''[[Mus musculus]]'' and the flowering plant ''[[Arabidopsis thaliana]]''.

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(CC) Photo: Max Westby
Male fruit fly.

The concept of a model organism or model species refers to biological species used in biomedicine research to exemplarily elucidate biological processes, especially at the molecular and cellular levels. It is widely studied, usually since it is easy to maintain and breed in a laboratory setting and has particular experimental advantages. They often have smaller genomes compared to their close relatives and recently many of them have been sequenced by genome projects. Some examples of model species include the bacterium Escherichia coli, the nematode worm Caenorhabditis elegans, the fruit fly Drosophila melanogaster, the zebra fish Danio rerio, the frog Xenopus laevis, the mouse Mus musculus and the flowering plant Arabidopsis thaliana.