Table 4.

Neither Δ1b^−/− nor Δ9d^−/− ES cells are viable

ES line	# Samples	Re-targeted original locus	Random insertions	Homozygous knockouts
Δ1b	397	51	346	0
Δ9d	330	6	324	0
Δ9ab	48	1	46	1

Note, Δ1b data has been previously reported in Hook.²²