( ( The rhizobia ) ( ( ( ( penetrate ( to ( the ( inner ( cortical ( plant cells ) ) ) ) ) ) and ) ( become ( ( enclosed ( in sacs ) ) ( by ( plant ( plasma membranes ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN rhizobia)) (VP (VP (VB penetrate) (PP (TO to) (NP (DT the) (JJ inner) (JJ cortical) (NN plant) (NNS cells)))) (CC and) (VP (VB become) (VP (VBN enclosed) (PP (IN in) (NP (NNS sacs))) (PP (IN by) (NP (NN plant) (NN plasma) (NNS membranes)))))) (. .)))
The rhizobia penetrate to the inner cortical plant cells and become enclosed in sacs by plant plasma membranes.
(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))))) (. .)))