( ( Nuclear pores ) ( ( are ( ( large ( protein complexes ) ) ( that ( cross ( ( ( the ( nuclear envelope ) ) , ) ( which ( is ( ( the ( double membrane ) ) ( surrounding ( the ( eukaryotic ( cell nucleus ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Nuclear) (NNP pores)) (VP (VBP are) (NP (NP (JJ large) (NN protein) (NNS complexes)) (SBAR (WHNP (WDT that)) (S (VP (VBP cross) (NP (NP (DT the) (JJ nuclear) (NN envelope)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (NP (NP (DT the) (JJ double) (NN membrane)) (VP (VBG surrounding) (NP (DT the) (JJ eukaryotic) (NN cell) (NN nucleus))))))))))))) (. .)))
Nuclear pores are large protein complexes that cross the nuclear envelope, which is the double membrane surrounding the eukaryotic cell nucleus.
(ROOT (S (NP (NNP Nuclear) (NNP enevelope)) (VP (VBZ is) (NP (NP (DT a) (JJ double) (NN membrane)) (PP (IN of) (NP (NP (DT the) (NN nucleus)) (SBAR (WHNP (WDT that)) (S (VP (VBZ encloses) (NP (DT the) (JJ genetic) (NN material))))))))) (. .)))