( ( Skeleton ( of ( cartilage not ) ) ) ( ( ( bone b ) -RRB- ) . ) )
(ROOT (S (NP (NP (NNP Skeleton)) (PP (IN of) (NP (NN cartilage) (RB not)))) (VP (VBD bone) (X (NP (SYM b)))) (-RRB- -RRB-) (. .)))
Skeleton of cartilage not bone b).
(ROOT (S (ADVP (RB Early) (PP (IN in) (NP (NP (DT the) (NN development)) (PP (IN of) (NP (DT a) (JJ human) (NN fetus)))))) (, ,) (NP (DT the) (NN skeleton)) (VP (VBZ is) (VP (VBN made) (ADVP (RB entirely)) (PP (IN of) (NP (NN cartilage))))) (. .)))