( ( Identification ( of ( the ( infectious ( laryngotracheitis ( virus glycoprotein ) ) ) ) ) ) ( ( ( gB gene ) ( by ( the ( polymerase ( chain reaction ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Identification)) (PP (IN of) (NP (DT the) (JJ infectious) (JJ laryngotracheitis) (NN virus) (NN glycoprotein)))) (VP (VBP gB) (NP (NN gene)) (PP (IN by) (NP (DT the) (NN polymerase) (NN chain) (NN reaction)))) (. .)))
Identification of the infectious laryngotracheitis virus glycoprotein gB gene by the polymerase chain reaction.
(ROOT (S (NP (DT The) (NN polymerase) (NN chain) (NN reaction)) (VP (VBZ is) (NP (NP (DT a) (NN way)) (PP (IN of) (S (VP (VBG making) (NP (NP (NNS copies)) (PP (IN of) (NP (DT a) (NN gene))))))))) (. .)))