Whereas p53-null mice develop normally and are viable,
disrupting p63 or p73 in mice severely affects proper development.
p73-null mice suffer of hydrocephalia and hippocampal
dysgenesis, are much smaller than their wild type
counterparts, and 50 % to 75 % of the pups die before
4 weeks of age, mainly due to gastrointestinal hemorrhage,
followed by intracranial bleeding. Those mice that survive,
however, are not prone to tumorigenesis