the effect of 2 retinoids , 13-cis-retinoic acid and 4-methoxy-2,3,6-trimethylphenyl analog of retinoic acid ethyl amide ( designated roll-1430 ) , on tracheal tumor development in hamsters exposed to n-nitroso-n-methylurea was tested .
C0035339
retinoids
C0022265
13-cis-retinoic acid