Some Tfpi^−/−:Par4^−/− mice have short, kinked, and/or curly tails. (A) Representative photos of short tailed Tfpi^−/−:Par4^−/− mice. (B) The body length to tail length ratio of Tfpi^−/−:Par4^−/− (n = 38) and Tfpi^+/−:Par4^−/− (n = 35) littermate male mice was determined at 8 weeks of age. An increased ratio, because of decreased tail length, was observed in 11 (29%) Tfpi^−/−:Par4^−/− mice. Data points represent ratios of individual mice and black lines the average ratio.