Paternal transmission results in late fetal/neonatal lethality phenotype.

Normal (+/+) outbred CF1 and inbred, 129S1 and FVB, mothers were crossed with m(ChβGI)2/+ fathers and the offspring was genotyped at weaning. The number of wild type +/+ and mutant +/−(P) heterozygous young from each litter is given per row. Numbers in parentheses†indicate dead pups of greatly reduced size, found on the day of birth.