a chronic 8 to 11 week administration of the hepatic tumor promoter phenobarbital ( 0.05 % in drinking water ) to rats previously subjected to the initiation : selection process of solt and farber was found to further increase the gamma-glutamyl transpeptidase activity of individual hyperplastic liver nodules of 4.0-10.0 mm in diameter over comparably sized nodules from control livers .
C0341439
chronic
C0023884
livers