( ( After ( mRNA ( leaves ( the nucleus ) ) ) ) ( , ( it ( ( moves ( to ( ( ( a ribosome ) , ) ( which ( consists ( of ( ( rRNA and ) proteins ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN After) (S (NP (NN mRNA)) (VP (VBZ leaves) (NP (DT the) (NN nucleus))))) (, ,) (NP (PRP it)) (VP (VBZ moves) (PP (TO to) (NP (NP (DT a) (NN ribosome)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ consists) (PP (IN of) (NP (NN rRNA) (CC and) (NNS proteins))))))))) (. .)))
After mRNA leaves the nucleus, it moves to a ribosome, which consists of rRNA and proteins.
(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.