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Is there a database where I might list the phenotype of a certain rat knockout and/or search for other similar phenotypes?

There is a International Mouse Phenotyping Consortium, which has the goal of characterizing the phenotypical changes of homozygous knockouts for each of the 20,000 genes in the isogenic mouse line C57BL/6. The International Knockout Mouse Consortium is responsible for creating the knockouts and the two consortiums work together closely.

There is also a Knockout Rat Consortium, but I haven't found a Phenotype Change database for rats.

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the Jackson laboratory

Is the industry leader in transgenic mouse production. Their list of mouse strains is almost a db in itself but currently no db exists that I'm aware of. I take it your looking for something similar to what's available for c elegans:

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