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In page Arabidopsis thaliana:

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The A. thaliana gene knockout collections are a unique resource for plant biology made possible by the availability of high-throughput transformation and funding for genomics resources. The site of T-DNA insertions has been determined for over 300,000 independent transgenic lines, with the information and seeds accessible through online T-DNA databases.[3] Through these collections, insertional mutants are available for most genes in A. thaliana.[citation needed]