Table 2.

Breeding analysis of mice containing the 2275 inversion

Parent	Number of mice
	Progeny	Transgenic	Parental transgene	Transgene deletion	Homologous recombinants (expansion mice)
2275	36	16	7	6	3*
2949	40	21	14	6	1*
3308	16	9	1	3	5 (mice 3645, 3679, 3692)
3368	25	8	2	3	3 (mice 3688, 3691)
Total:	117	54 (46%)	24	18	12

Data for mice 2275 and 2949 have been previously reported (9). 

^*The transgene structures in these mice were not examined in as much detail as in subsequent mice, but more limited analysis suggested that each had undergone a transgene expansion.