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Fig. 4. Skeletal defects observed in Bmp4lacZ/+ mice are not
present in Bmp4S2G/S2G mice. (A,B)
Alcian Blue-stained E15.5 limbs. A postaxial cartilaginous element is
indicated with an asterisk. (C-F) Dorsal views of skeletal preparations
of cervical (C,D) and thoracic (E,F) vertebrae from adults. Yellow arrowheads
mark vertebrae that have not fused and/or formed a dorsal spinous process.
Black arrows indicate the 13th rib.