Table 1. Distribution of offspring by PRL1 or PRL2 heterozygous-heterozygous mating at weaning indicates a survival disadvantage of PRL1 and PRL2 knockout mice.

	+/+	+/−	−/−	n	χ2	p
PRL1
Observed	187	353	143	683	6.44	<0.05
Expected	171	342	171
PRL2
Observed	139	307	73	519	34.18	<0.001
Expected	130	260	130