hydroxyapatite-chromatographic analysis of adp-ribose residues released from protein by alkaline digestion showed a spectrum of molecular sizes including mono- , oligo- and poly- ( adp-ribose ) , when chromatin was incubated initially with [ 14c ] nad+ for 10 min and then for a further 30 min after addition of excess non-radioactive nad+ , only about 10 % of the radioactive mono- ( adp-ribose ) could be 'chased ' into longer-chain molecules .
C0032403
poly
C0001461
adp-ribose