( ( ( Radiation-induced mutations ) ( in ( unirradiated DNA ) ) ) . )
(ROOT (NP (NP (JJ Radiation-induced) (NNS mutations)) (PP (IN in) (NP (JJ unirradiated) (NN DNA))) (. .)))
Radiation-induced mutations in unirradiated DNA.
(ROOT (S (NP (NNP Induced) (CC or) (NNP spontaneous)) (VP (VBP are) (NP (NP (DT the) (CD two) (NNS methods)) (SBAR (WHPP (IN in) (WHNP (WDT which))) (S (NP (NNS mutations)) (VP (VBP arise) (PP (IN in) (NP (NN dna)))))))) (. .)))