'Heterosis' in litter size of chimaeric mice.
D000818:Animals; D002678:Chimera; D003433:Crosses, Genetic; D004622:Embryo, Mammalian / Q000502:physiology; D005260:Female; D005838:Genotype; D008098:Litter Size; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C / Q000235:genetics; D008810:Mice, Inbred C57BL / Q000235:genetics; D008813:Mice, Inbred ICR / Q000235:genetics; D008815:Mice, Inbred Strains / Q000235:genetics*; D010053:Ovary / Q000502:physiology; D011247:Pregnancy; D013045:Species Specificity