Knockout Mouse Project Repository; mouse embryonic stem cells containing null mutations in every gene in the mouse genome. (omim.org)
Genomic (in) stability: We have established several cell lines and mice carrying null mutations for specific DNA repair functions. (cmbn.no)
28.04 % of tested genes with null mutations on a B6N genetic background have a phenotype association to abnormal behavior (1360/4850) (mousephenotype.org)