( ( ( ( ( The concern ) ( ( ( is not ) only ) ( cancer ( in ( 15 years ) ) ) ) ) ; ) ( ( a ( healthy ( mucosal barrier ) ) ) ( ( is also ) ( essential ( to ( protect ( ( the ( ( gut and ) airways ) ) ( against pathogens ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT The) (NN concern)) (VP (VBZ is) (RB not) (ADVP (RB only)) (NP (NP (NN cancer)) (PP (IN in) (NP (CD 15) (NNS years)))))) (: ;) (S (NP (DT a) (JJ healthy) (JJ mucosal) (NN barrier)) (VP (VBZ is) (ADVP (RB also)) (ADJP (JJ essential) (S (VP (TO to) (VP (VB protect) (NP (NP (DT the) (NN gut) (CC and) (NNS airways)) (PP (IN against) (NP (NNS pathogens)))))))))) (. .)))
The concern is not only cancer in 15 years; a healthy mucosal barrier is also essential to protect the gut and airways against pathogens.
(ROOT (S (NP (JJ Mucosal) (NNS tissues)) (VP (VBP are) (NP (NP (JJ major) (NNS barriers)) (PP (TO to) (NP (NP (DT the) (NN entry)) (PP (IN of) (NP (NNS pathogens)))))) (PP (IN into) (NP (DT the) (NN body)))) (. .)))