pulse labeling with [ 14c ] ribose results in a parallel doubling in dimethylnitrosamine-treated animals of the specific activities of adenosine- diphosphoribose and nad+ and of the [ 14c ] ribose content of polyadenosine-diphosphoribose of chain length between 20 and 40 , indicating chain elongation of pre-existing larger polymers .
C0001461
adenosine
C0032403
polyadenosine-diphosphoribose