( However ( , ( ( most ( of ( the ( plant body ) ) ) ) ( ( is ( ( formed ( by ( ( postembryonal ( cell division ) ) ( of ( ( two groups ) ( of ( stem cells ) ) ) ) ) ) ) ( at ( ( each end ) ( of ( ( ( the ( apical-basal axis ) ) , ) ( called ( shoot ( and ( root meristems ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB However)) (, ,) (NP (NP (JJS most)) (PP (IN of) (NP (DT the) (NN plant) (NN body)))) (VP (VBZ is) (VP (VBN formed) (PP (IN by) (NP (NP (JJ postembryonal) (NN cell) (NN division)) (PP (IN of) (NP (NP (CD two) (NNS groups)) (PP (IN of) (NP (NN stem) (NNS cells))))))) (PP (IN at) (NP (NP (DT each) (NN end)) (PP (IN of) (NP (NP (DT the) (JJ apical-basal) (NNS axis)) (, ,) (VP (VBN called) (NP (NN shoot) (CC and) (NN root) (NNS meristems))))))))) (. .)))
However, most of the plant body is formed by postembryonal cell division of two groups of stem cells at each end of the apical-basal axis, called shoot and root meristems.
(ROOT (S (NP (NP (DT The) (NNS axis)) (PP (IN of) (NP (DT the) (NN plant)))) (VP (VBZ has) (NP (NP (DT a) (NN root) (NN end)) (CC and) (NP (DT a) (NN shoot) (NN end)))) (. .)))