( ( ( ( The Effect ) ( of Catalysts ) ) ( on ( Reaction Rates ) ) ) . )
(ROOT (NP (NP (DT The) (NN Effect)) (PP (IN of) (NP (NNP Catalysts))) (PP (IN on) (NP (NNP Reaction) (NNP Rates))) (. .)))
The Effect of Catalysts on Reaction Rates.
(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)) (. .)))