Putative skeletal neural crest cells in early late ordovician vertebrates from colorado.

@article{Smith1991PutativeSN,
  title={Putative skeletal neural crest cells in early late ordovician vertebrates from colorado.},
  author={Moya Meredith Smith},
  journal={Science},
  year={1991},
  volume={251 4991},
  pages={301-3}
}
Two vertebrates from the Colorado Formation are known to have acellular bone and dentine, tissues found in heterostracan fishes and proposed as the primitive exoskeleton. High-resolution optical microscopy and scanning electron microscopy indicate that a third vertebrate is represented by a quite distinct exoskeleton of denticles, with many cell and cell process spaces throughout, tissue that resembles that of osteostracans more than heterostracans. Cellular bone coexists with cellular dentine… CONTINUE READING

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