( It ( ( ( does not ) ( affect ( ( ( the ( small intestine ) ) or ) ( the stomach ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ does) (RB not) (VP (VB affect) (NP (NP (DT the) (JJ small) (NN intestine)) (CC or) (NP (DT the) (NN stomach))))) (. .)))
It does not affect the small intestine or the stomach .
(ROOT (S (NP (DT The) (JJ small) (NN intestine)) (VP (VBZ begins) (PP (IN in) (NP (DT the) (NN stomach)))) (. .)))