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. 2013 Jun 13;9(6):e1003491. doi: 10.1371/journal.pgen.1003491

Figure 6. The mice were generated by creating a chimera with heterozygous 129/Sv cells in a C56Bl/6J blastocyst.

Figure 6

The chimera was crossed with a wildtype C56Bl/6J to obtain heterozygous KOs and homozygous WTs. The heterozygous KOs were backcrossed to wildtype C56Bl/6J to obtain animals that are 75% C56Bl/6J. The male and female heterozygous KOs are intercrossed and only the resulting wildtype males are used in this study. The complicated structure of the cross is due to the fact that the knockouts were designed to be used subsequently for other studies.