( ( Catalyst ( for ( slow transits ) ) ) ; )
(ROOT (NP (NP (NNP Catalyst)) (PP (IN for) (NP (JJ slow) (NNS transits))) (: ;)))
Catalyst for slow transits;
(ROOT (S (SBAR (IN If) (S (NP (DT a) (NN catalyst)) (VP (VBZ runs) (PRT (RP out))))) (, ,) (NP (DT the) (NN reaction)) (VP (VBZ slows)) (. .)))