( This ( ( ( is now ) ( done ( using ( ( molecular techniques ) ( such ( as ( ( ( ( polymerase ( chain reaction ) ) ( for ( viral RNA ) ) ) , ) ( ( the ( genetic material ) ) ( inside ( the ( virus shell ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBZ is) (ADVP (RB now)) (VP (VBN done) (S (VP (VBG using) (NP (NP (JJ molecular) (NNS techniques)) (PP (JJ such) (IN as) (NP (NP (NP (NN polymerase) (NN chain) (NN reaction)) (PP (IN for) (NP (JJ viral) (NNP RNA)))) (, ,) (NP (NP (DT the) (JJ genetic) (NN material)) (PP (IN inside) (NP (DT the) (NN virus) (NN shell))))))))))) (. .)))
This is now done using molecular techniques such as polymerase chain reaction for viral RNA, the genetic material inside the virus shell.
(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.