AgNOR

(redirected from Argyrophilic Nucleolar Organizer Region)
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AgNOR

Argyrophilic Nucleolar Organizer Region. A loop of nucleolar DNA which encodes rRNA. AgNORs reflect proliferation; the number of AgNORs may correlate with tumour behaviour. In Kaposi sarcoma, AgNOR staining in tissue increases as the tumours become more aggressive.