( ( ( ( The NUCLEOPLASM ) ( of ( the nucleus ) ) ) ( is ( surrounded ( by ( a ( double-layer membrane ) ) ) ) ) ) ( , ( ( the NUCLEAR ) ( ( ENVELOPE ( ( ( OR MEMBRANE ) , ) ( which ( is ( perforated ( by pores ) ) ) ) ) ) . ) ) ) )
(ROOT (S (S (NP (NP (DT The) (NNP NUCLEOPLASM)) (PP (IN of) (NP (DT the) (NN nucleus)))) (VP (VBZ is) (VP (VBN surrounded) (PP (IN by) (NP (DT a) (JJ double-layer) (NN membrane)))))) (, ,) (NP (DT the) (NN NUCLEAR)) (VP (VBP ENVELOPE) (NP (NP (NNP OR) (NNP MEMBRANE)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (VP (VBN perforated) (PP (IN by) (NP (NNP pores))))))))) (. .)))
The NUCLEOPLASM of the nucleus is surrounded by a double-layer membrane, the NUCLEAR ENVELOPE OR MEMBRANE, which is perforated by pores.
(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))))))))) (. .)))