tail bone

The buttocks and tail bone sit [ over ] the heel of the rear foot.

臀部尾间坐在后脚跟.

The number of tail bone is different: Henan 26, Hebei 28. Conclusion Because of long closed breeding, KM mice of Henan Medical University are difference at tail length and the number of tail bone from other KM mice. The tail is more longer.

本中心小鼠尾骨节数分别为26，而河北医科大学KM小鼠尾骨为28节。结论：由于长期的封闭饲养，本中心KM小鼠与其它KM小鼠存在差异：尾较长，30周龄长2cm。

But the deformity rate of rat sperm, the micronucleus rate of bone marrow cells, Comet tail length and percentage of tail DNA increased in F_0 and F_1 generations of both medium-dose and high-dose groups ( P < 0.01).

但中、高剂量组F0和F1代的精子畸形率、骨髓细胞微核率和彗星细胞率均增加（P<0.01），并与摄入贫铀的剂量和摄入时间呈一定的相关关系。