Decreased survival of Gstp-null ApcMin mice. Kaplan-Meier survival curve showing Gstp-wt ApcMin (n = 30, 21 males and 9 females) and Gstp-null ApcMin mice (n = 32, 22 males and 10 females). These data are based on observed morbidity: that is, repeated rectal prolapse, rectal bleeding, blood in feces, within the terms of the Animal (Scientific Procedures) Act (1986).