( ( PCR ( with ( mismatched primers ) ) ) ( ( ( induced ( restriction sites ) ) ( ( ( in ( normal DNA ) ) ( but not ) ) ( in ( mutational DNA ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP PCR)) (PP (IN with) (NP (JJ mismatched) (NNS primers)))) (VP (VBN induced) (NP (NN restriction) (NNS sites)) (PP (PP (IN in) (NP (JJ normal) (NN DNA))) (CONJP (CC but) (RB not)) (PP (IN in) (NP (JJ mutational) (NN DNA))))) (. .)))
PCR with mismatched primers induced restriction sites in normal DNA but not in mutational 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)))))))) (. .)))