( ( enzyme ( ( A catalyst ) ( produced ( by ( living cells ) ) ) ) ) . )
(ROOT (S (VP (VB enzyme) (NP (NP (DT A) (NN catalyst)) (VP (VBN produced) (PP (IN by) (NP (VBG living) (NNS cells)))))) (. .)))
enzyme A catalyst produced by living cells.
(ROOT (S (NP (PRP You)) (VP (VBP call) (NP (NP (NNS catalysts)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (VP (VBN found) (ADVP (RB inside)) (PP (IN of) (S (VP (VBG living) (NP (NNS things) (NNS enzymes))))))))))) (. .)))