Table 2.

Genotype and phenotype analyses of Tbxt^Δexon6 and Tbxt^insRCS2 breeding results

Breeding type	Offspring genotypes	Total no. of mice examined	Tail phenotypes
			No tail	Short tail	Kinked tail	Long tail
TbxtinsRCS2/+ × Tbxt∆exon6/+	TbxtinsRCS2/∆exon6	7	7 (2)a	0	0	0
	Tbxt∆exon6/+	11	0	0	1	10
	TbxtinsRCS2/+ or Tbxt+/+	12	0	0	0	12
TbxtinsRCS2/insRCS2 × Tbxt∆exon6/+	TbxtinsRCS2/∆exon6	12	12 (4)a	0	0	0
	TbxtinsRCS2/+	30	0	0	0	30

Note that tail phenotypes were categorized into no tail, short tail, kinked tail and long tail, as exemplified in Fig. 3e.

^aNumbers in parentheses indicate 2 mice out of the 7, and 4 out of the 12, were runts and died between 1 and 3 months after birth.