( ( DNA sensors ) ( on ( ( a ( ( substrate one ) nucleotide ) ) ( at a ) ) ) )
(ROOT (NP (NP (NN DNA) (NNS sensors)) (PP (IN on) (NP (NP (DT a) (ADJP (JJ substrate) (NP (CD one))) (NN nucleotide)) (ADVP (IN at) (DT a))))))
DNA sensors on a substrate one nucleotide at a
(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)))))))