( gacA ( ( was ( ( identified in ) ( both ( the ( plant ( and ( nematode ( screens -RRB- ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN gacA)) (VP (VBD was) (VP (VBN identified) (PRT (RP in)) (NP (PDT both) (DT the) (NN plant) (CC and) (NN nematode) (NNS screens) (-RRB- -RRB-)))) (. .)))
gacA was identified in both the plant and nematode screens).
(ROOT (S (NP (NNS Nematodes)) (VP (MD can) (VP (VB be) (NP (NP (DT a) (NN parasite)) (PP (IN of) (NP (DT both)))))) (. .)))
Nematodes can be a parasite of both.