( ( The ( helper virus ) ) ( ( ( ( is ( used ( to ( ( coinfect cells ) ( alongside ( the ( viral vector ) ) ) ) ) ) ) and ) ( ( provides ( the ( necessary enzymes ) ) ) ( for ( replication ( of ( ( the genome ) ( of ( the ( viral vector ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN helper) (NN virus)) (VP (VP (VBZ is) (VP (VBN used) (S (VP (TO to) (VP (VB coinfect) (NP (NNS cells)) (PP (IN alongside) (NP (DT the) (JJ viral) (NN vector)))))))) (CC and) (VP (VBZ provides) (NP (DT the) (JJ necessary) (NNS enzymes)) (PP (IN for) (NP (NP (NN replication)) (PP (IN of) (NP (NP (DT the) (NN genome)) (PP (IN of) (NP (DT the) (JJ viral) (NN vector))))))))) (. .)))
The helper virus is used to coinfect cells alongside the viral vector and provides the necessary enzymes for replication of the genome of the viral vector.
(ROOT (S (NP (DT A) (JJ viral) (NN vector)) (VP (VBZ is) (NP (NP (DT the) (NN name)) (PP (IN for) (NP (NP (DT a) (NN tool)) (VP (ADVP (RB commonly)) (VBN used) (PP (IN by) (NP (JJ molecular) (NNS biologists))) (S (VP (TO to) (VP (VB place) (NP (JJ genetic) (NN material)) (PP (IN into) (NP (NNS cells))))))))))) (. .)))
A viral vector is the name for a tool commonly used by molecular biologists to place genetic material into cells.