a, Progeny of heterozygous Bcl11a m+62 orthologue deletion intercrosses as compared to expected Mendelian ratio. b, Fraction of fetal liver comprised of B-cell progenitors at E16.5 from various genotypes. c, Peripheral blood analysis from 4-week-old mice to examine the frequency of various circulating haematopoietic lineages in Bcl11a m+62 orthologue deletion wild-type, heterozygous, and homozygous mice. d, Bcl11a expression in β-YAC/+62 deletion mice (each symbol represents the mean expression from technical replicates from an individual mouse). *P < 0.05; error bars represent s.e.m.