( Ribosomes ( ( are ( ( small organelles ) ( containing ( ( ( ( ( 50 % ) ( ribosomal RNA ) ) ( -LRB- ( rRNA -RRB- ) ) ) and ) ( ( 50 % ) protein ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Ribosomes)) (VP (VBP are) (NP (NP (JJ small) (NNS organelles)) (VP (VBG containing) (NP (NP (NP (ADJP (CD 50) (NN %)) (JJ ribosomal) (NNS RNA)) (PRN (-LRB- -LRB-) (NP (NNP rRNA)) (-RRB- -RRB-))) (CC and) (NP (ADJP (CD 50) (NN %)) (NN protein)))))) (. .)))
Ribosomes are small organelles containing 50% ribosomal RNA (rRNA) and 50% protein.
(ROOT (S (NP (DT A) (NN ribosome)) (VP (VBZ consists) (PP (IN of) (NP (NP (CD two) (NNS elements)) (, ,) (NP (NN rrna)) (CC and) (NP (NNS proteins))))) (. .)))
A ribosome consists of two elements, rrna and proteins.