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Yellen, speaking a week after the Fed delayed a long-anticipated rate hike, said she and other Fed policymakers do not expect recent global economic and financial market developments to significantly affect the centra bank's policy.

The centra of the cervical and dorsal vertebrae have peculiar, S-shaped articular surfaces, and they interlock tightly.

When the vertebrae are free their centra articulate with each other by complicated joints, exhibiting four types.

All are of the coelacanth type, having Y-shaped neural and haemal arches, without centra.

The cartilage is hard and semi-transparent, the notochord jelly-like, least at the centres of the centra, and at a maximum intervertebrally.-