( ( ( Effect ( on secretion ) ) ( of ( saliva ( and ( digestive enzymes ) ) ) ) ) . )
(ROOT (NP (NP (NN Effect)) (PP (IN on) (NP (NN secretion))) (PP (IN of) (NP (NN saliva) (CC and) (NN digestive) (NNS enzymes))) (. .)))
Effect on secretion of saliva and digestive enzymes.
(ROOT (S (NP (NNP Saliva) (NNP secretion)) (VP (VBZ initiates) (NP (NN chemical) (NN digestion)) (PP (IN while) (S (ADVP (RB also)) (VP (VBG protecting) (NP (DT the) (JJ oral) (NN cavity)))))) (. .)))