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Fresh and fixed tissue from a resection specimen of a calcifying epithelial odontogenie lumour (CEOT) was prepared for histologieal, histoehemieal, immunological and bioehemical investigation in order to sludy the nature of the amyloid-like material. The fixed tissue gave positive reactions with Congo-red. Thioflavin T and the dimethylamino benzene (DMAB)-method for tryptophan. The diazotization-eoiipling (DC) method for tyrosine was negative. The major protein purified liom Ihe unfixed tissue by sec]ucntial gel filtration had a moleeular weight of 9,800. The amino acid analysis of this protein had similarities with tuft enamel protein, immune amyloid and the variable light ehain component (VK).

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