( ( giant ( muscle proteins ) ) ( ( ( titin and ) nebulin ) . ) )
(ROOT (S (NP (JJ giant) (NN muscle) (NNS proteins)) (VP (VBP titin) (CC and) (VBP nebulin)) (. .)))
giant muscle proteins titin and nebulin.
(ROOT (S (NP (DT The) (ADJP (JJS largest) (VBN known)) (NNS proteins)) (VP (VBP are) (ADJP (JJ titins))) (. .)))