( ( ( Ribozymes , ) ( ( ( ( RNA processing ) , ) and ) ( RNA-protein interactions ) ) ) ; )
(ROOT (NP (NP (NNS Ribozymes)) (, ,) (NP (NP (NNP RNA) (NN processing)) (, ,) (CC and) (NP (JJ RNA-protein) (NNS interactions))) (: ;)))
Ribozymes, RNA processing, and RNA-protein interactions;
(ROOT (S (NP (NP (DT The) (NN discovery)) (PP (IN of) (NP (NNS ribozymes)))) (VP (VBD nullified) (NP (DT the) (NN idea)) (SBAR (IN that) (S (NP (DT all) (JJ biological) (NNS catalysts)) (VP (VBP are) (NP (NNS proteins)))))) (. .)))