Table I. Ratio of the human (γ + β) mRNA to mouse α mRNA in the fetal liver per copy of the human locus as determined by S1 nuclease protection analysis.

	Day of development
	12	14	16
wtγβ	0.22	0.30	0.42
–50γln2	0.24	0.35	0.45
–50γln2+/–	0.21	0.31	0.42
–50γln4	0.20	0.32	0.33
–50γln7	0.28	0.32	0.35

The left hand column shows mouse lines (ln2+/– is ln2 in the EKLF+/– background). The other columns are the ratios at days 12, 14 and 16 of development.