Fig. 6. Vertebral homeotic transformations in the posterior thoracic and lumbosacral region of OE mice compared with wild type. (A,B) Dorsal views; numbers indicate the most anterior vertebrae bearing ribs, most posterior vertebrae bearing ribs and the first sacral vertebrae. (C-F) Ventral views; numbers indicate the most anterior vertebrae bearing ribs, most posterior vertebrae with ribs attached to sternum, and most posterior vertebrae bearing ribs. f, fused ribs. A, C and Fig. 5A show different views of the same skeleton.