( Furthermore ( , ( ( compared ( to ( protein enzymes ) ) ) ( , ( ribozymes ( ( ( seemed ( ( slow and ) inefficient ) ) ( as catalysts ) ) . ) ) ) ) ) )
(ROOT (S (ADVP (RB Furthermore)) (, ,) (PP (VBN compared) (PP (TO to) (NP (NN protein) (NNS enzymes)))) (, ,) (NP (NNS ribozymes)) (VP (VBD seemed) (ADJP (JJ slow) (CC and) (JJ inefficient)) (PP (IN as) (NP (NNS catalysts)))) (. .)))
Furthermore, compared to protein enzymes, ribozymes seemed slow and inefficient as catalysts.
(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)))))) (. .)))