( ( ( The association ) ( of ( ( gibberellin-like activity ) ( with ( ( the ( chloroplast fraction ) ) ( of leaf ) ) ) ) ) ) ( homogenates . ) )
(ROOT (S (NP (NP (DT The) (NN association)) (PP (IN of) (NP (NP (JJ gibberellin-like) (NN activity)) (PP (IN with) (NP (NP (DT the) (JJ chloroplast) (NN fraction)) (PP (IN of) (NP (NN leaf)))))))) (VP (VBZ homogenates)) (. .)))
The association of gibberellin-like activity with the chloroplast fraction of leaf homogenates.
(ROOT (S (NP (JJ Young) (NNS roots) (CC and) (NNS leaves)) (VP (VBP are) (NP (NP (DT the) (JJ major) (NNS sites)) (PP (IN of) (NP (NN gibberellin) (NN production))))) (. .)))