The relative contribution of genetic and socio-cultural factors in the shaping of behavior is of fundamental importance to biologists and social scientists, yet it has proven to be extremely difficult
Mice were generated from intercrosses between animals carrying Lrig1 and Lrig2 (top) or Lrig1 and Lrig3 mutant alleles (top). The number of mice carrying each genotype at postnatal day 7 (P7) and at 6
