( ( This flexibility ) ( ( is ( due ( to ( ( the ( special properties ) ) ( of ( ( ( the ( titin protein ) ) , ) ( which ( forms ( ( the bridge ) ( between ( ( ( the ( myosin ( II bundle ) ) ) and ) ( the Z-line ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This) (NN flexibility)) (VP (VBZ is) (ADJP (JJ due) (PP (TO to) (NP (NP (DT the) (JJ special) (NNS properties)) (PP (IN of) (NP (NP (DT the) (NN titin) (NN protein)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ forms) (NP (NP (DT the) (NN bridge)) (PP (IN between) (NP (NP (DT the) (JJ myosin) (NNP II) (NN bundle)) (CC and) (NP (DT the) (NN Z-line)))))))))))))) (. .)))
This flexibility is due to the special properties of the titin protein, which forms the bridge between the myosin II bundle and the Z-line.
(ROOT (S (NP (DT The) (ADJP (JJS largest) (VBN known)) (NNS proteins)) (VP (VBP are) (ADJP (JJ titins))) (. .)))