( ( ( a ( membrane ( enclosed sac ) ) ) ( of enzymes ) ) ( ( found ( in ( ( the cytoplasm ) ( of ( animal cells ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT a) (JJ membrane) (VBN enclosed) (NN sac)) (PP (IN of) (NP (NNS enzymes)))) (VP (VBD found) (PP (IN in) (NP (NP (DT the) (NN cytoplasm)) (PP (IN of) (NP (NN animal) (NNS cells)))))) (. .)))
a membrane enclosed sac of enzymes found in the cytoplasm of animal cells.
(ROOT (S (NP (DT A) (NN plasma) (NN membrane)) (VP (VBZ encloses) (NP (NP (DT the) (NN border)) (PP (IN of) (NP (NN animal) (NNS cells))))) (. .)))