paranuclein

from The Century Dictionary.

• noun A phosphorized complex which is split off and thrown down at a certain stage in the process of digesting nucleoalbumins with pepsin and hydrochloric acid. It subsequently becomes dissolved. Chittenden's dyspeptone, obtained from casein, is probably a paranuclein. Unlike the true nucleins the paranucleins do not yield xanthin bases on decomposition. Also called pseudonuclein.
• noun In cytology, the pyrenin of Schwarz; the substance of plasmosomes, or true nucleoli: said to consist of compounds of albumin and paranucleic acid.