( Titin ( ( is ( ( ( another ( polymeric ( muscle protein ) ) ) , ) ( responsible ( for ( ( the ( passive elasticity ) ) ( in muscle ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Titin)) (VP (VBZ is) (NP (NP (DT another) (JJ polymeric) (NN muscle) (NN protein)) (, ,) (ADJP (JJ responsible) (PP (IN for) (NP (NP (DT the) (JJ passive) (NN elasticity)) (PP (IN in) (NP (NN muscle)))))))) (. .)))
Titin is another polymeric muscle protein, responsible for the passive elasticity in muscle.
(ROOT (S (NP (DT The) (ADJP (JJS largest) (VBN known)) (NNS proteins)) (VP (VBP are) (ADJP (JJ titins))) (. .)))