( ( ( ( Exonucleases ( remove ( these ( unpaired nucleotides ) ) ) ) and ) ( ( the gaps ) ( are ( filled ( by ( ( ( DNA synthesis ) and ) ( repair machinery ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NNS Exonucleases)) (VP (VB remove) (NP (DT these) (JJ unpaired) (NNS nucleotides)))) (CC and) (S (NP (DT the) (NNS gaps)) (VP (VBP are) (VP (VBN filled) (PP (IN by) (NP (NP (NNP DNA) (NNP synthesis)) (CC and) (NP (NN repair) (NN machinery))))))) (. .)))
Exonucleases remove these unpaired nucleotides and the gaps are filled by DNA synthesis and repair machinery.
(ROOT (S (ADVP (RB Deletions)) (VP (VB remove) (NP (NP (QP (CD one) (CC or) (JJR more)) (NNS nucleotides)) (PP (IN from) (NP (DT the) (NN dna)))))))