Citation: Sr. Frame et al., PROLIFERATIVE ACTIVITY OF KERATOACANTHOMA AND PARA-ARAMID-INDUCED KERATINIZING SQUAMOUS LESIONS OF THE LUNGS OF RATS AS ASSESSED BY THE PROLIFERATING CELL NUCLEAR ANTIGEN AND NUCLEOLAR ORGANIZER REGIONS, Experimental and toxicologic pathology, 48(6), 1996, pp. 523-525