( ( ( The ( light reactions ) ) ( of photosynthesis ) ) ( ( occur ( in ( the ( thylakoid membranes ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ light) (NNS reactions)) (PP (IN of) (NP (NN photosynthesis)))) (VP (VBP occur) (PP (IN in) (NP (DT the) (JJ thylakoid) (NNS membranes)))) (. .)))
The light reactions of photosynthesis occur in the thylakoid membranes.
(ROOT (S (NP (DT The) (JJ light) (NNS reactions)) (VP (VBP take) (NP (NP (NN place)) (PP (IN in) (NP (DT the) (NN thylakoid))))) (. .)))