( ( ( ( ( Tube 4 ) ( was ( placed ( in ( high light ) ) ) ) ) but ) ( it ( ( did not ) ( contain ( any ( thylakoid membranes ) ) ) ) ) ) . )
(ROOT (S (S (NP (NNP Tube) (CD 4)) (VP (VBD was) (VP (VBN placed) (PP (IN in) (NP (JJ high) (NN light)))))) (CC but) (S (NP (PRP it)) (VP (VBD did) (RB not) (VP (VB contain) (NP (DT any) (JJ thylakoid) (NNS membranes))))) (. .)))
Tube 4 was placed in high light but it did not contain any 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))))) (. .)))