From The Collaborative International Dictionary of English v.0.48:

Nuclein \Nu"cle*in\, n. (Physiol. Chem.)
   A constituent of the nuclei of all cells, containing protein
   and nucleic acid. It is a colorless amorphous substance,
   readily soluble in alkaline fluids and especially
   characterized by its comparatively large content of
   phosphorus. It also contains nitrogen and sulphur.
   [1913 Webster +PJC]
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