While Del(9)olt1Pas homozygous mutant mice show a mild predominantly ventral alopecia due to the deletion of the Plcd1 gene [47], homozygotes of the Plcd3mNab mutant allele have no obvious phenotype, which has also been described for mice in which Plcd3 was inactivated by homologous recombination [38]. The gene discussed is PLCD1; the disease is alopecia.