starting at the end of 2-aaf feeding , a mixture of ribonucleosides ( rns ) of adenine , cytosine , guanine and uracil and of deoxyribonucleosides ( drns ) of adenine , cytosine , guanine and thymine were injected i.p . every 8 h for 12 days to the rats subjected to the initiation-selection treatments plus pb .
C0041917
uracil
C0040087
thymine