| Type | MGI:General | Description | incidence of lumbar defects in reduced in mice on a mixed 129S/SvEv and C57BL/6 background compared to mice on a 129S/SvEv background deformation or partial fusion of one or more vertebral bodies in 9 of 10 mice in the lumbar region in 2 of 10 pups pointed outgrowths that do not fuse are detected |
