skeleton

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Skates and rays are close relatives of sharks, sharing similar traits, including external gill openings and a cartilaginous skeleton, hence the predominantly blue colour of this specimen.
A new procedure for whole-mount alcian blue staining of the cartilaginous skeleton of chicken embryos, adapted to the clearing procedure in potassium hydroxide.
The lack of that organ is compensated for by the light weight of the cartilaginous skeleton, the presence of a large liver, and by the continuous movement they must maintain to keep afloat.