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amyloid (adjective) – in general: staining with iodine solutions; i. e., changing colour from yellow to reddish, blue or purple; a general diagnostic test for the presence of starch-like polysaccharides (fungal starch: amylomycan, lichenan); used either to detect the presence or absence of storage polysaccharides in the thallus or as an important diagnostic characteristic to visualize structural differences in the tholus of immature asci; in a more strict sense amyloid refers only to blue (or more or less purple) colour reactions. Related terms: euamyloid, hemiamyloid, dextrinoid; Lugol's solution, Meltzer's reagent.

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