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. 2007 Aug 24;104(36):14406–14411. doi: 10.1073/pnas.0700608104

Table 1.

Insertions per mutant ES cell clone

No. of insertions per clone ES clones, %
1 38
2 32
3 12
4 8
5 6
6 1
7 3

Purified clones with insertions in GPCR genes (total of 105 characterized clones) were checked for the total number of the vector insertions by quantitative slot-blot hybridization. We found up to seven insertions per mutant clone.