differing lengths of niehs chrysotile with benzopyrene [ b ( a ) p , b ( e ) p ] ( organic by-products of combustion ) were applied on normal human fibroblasts ( cell line ci ) to test for cytotoxicity ( survival determined by colony-forming efficiency ) , binding of benzopyrene to dna , and the production of benzopyrene metabolites .
C0005052
b ( a ) p
C0005082
benzopyrene