A toxic nucleoside isolated from the mushroom Agaricus nebularis and from Streptomyces sp. SYN: 9-β-ribofuranosylpurine, purine ribonucleoside, ribosylpurine.
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neb·u·lar·ine (neb-u-larґin) an antibiotic substance isolated from the juice of the fungus Clitocybe nebularis, which has tuberculostatic and antimitotic activity, and in high dilutions preferentially inhibits growth of some cancer cells.Medical dictionary. 2011.