( ( ( non-photosynthetic cells ) ( ( where ( ( ( CO 2 ) ( is ( incorporated ( into ( ( organic acids ) ( in ( C4 plants ) ) ) ) ) ) ) -RRB- ) ) ( ( ( ( bundle ( sheath cell ) ) -LRB- ) ( in C3 ) ) ( ( leaves , ) ( ( these cells ) ( surrounding ( the vein ) ) ) ) ) ) ) ( ( are nonphotosynthetic ) ; ) )
(ROOT (S (NP (NP (JJ non-photosynthetic) (NNS cells)) (SBAR (WHADVP (WRB where)) (PRN (S (NP (NNP CO) (CD 2)) (VP (VBZ is) (VP (VBN incorporated) (PP (IN into) (NP (NP (JJ organic) (NNS acids)) (PP (IN in) (NP (CD C4) (NNS plants)))))))) (-RRB- -RRB-)) (S (NP (NP (NN bundle) (NN sheath) (NN cell)) (-LRB- -LRB-) (PP (IN in) (NP (NNP C3)))) (VP (VBZ leaves) (, ,) (S (NP (DT these) (NNS cells)) (VP (VBG surrounding) (NP (DT the) (NN vein)))))))) (VP (VBP are) (ADJP (JJ nonphotosynthetic))) (: ;)))
non-photosynthetic cells where CO 2 is incorporated into organic acids in C4 plants) bundle sheath cell (in C3 leaves, these cells surrounding the vein are nonphotosynthetic;
(ROOT (S (NP (NNS Leaves)) (VP (VBP export) (NP (NN sugar)) (PP (TO to) (NP (NP (NNS roots)) (CC and) (NP (NP (JJ other) (JJ nonphotosynthetic) (NNS parts)) (PP (IN of) (NP (DT the) (NN plant)))))) (PP (IN through) (NP (DT the) (NNS veins)))) (. .)))