( ( ( ( ( CYP1A1 ( catalyzes ( ( the bioactivation ) ( of ( ( a number ) ( of ( environmental ( and ( dietary procarcinogens ) ) ) ) ) ) ) ) ) , ) therefore ) ( ( differences ( in ( ( the ( activity ( or ( expression levels ) ) ) ) ( of ( this enzyme ) ) ) ) ) ( could ( be ( ( an ( important factor ) ) ( in ( colorectal ( cancer risk ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (NNP CYP1A1)) (VP (VBZ catalyzes) (NP (NP (DT the) (NN bioactivation)) (PP (IN of) (NP (NP (DT a) (NN number)) (PP (IN of) (NP (JJ environmental) (CC and) (JJ dietary) (NNS procarcinogens)))))))) (, ,) (ADVP (RB therefore)) (S (NP (NP (NNS differences)) (PP (IN in) (NP (NP (DT the) (NN activity) (CC or) (NN expression) (NNS levels)) (PP (IN of) (NP (DT this) (NN enzyme)))))) (VP (MD could) (VP (VB be) (NP (NP (DT an) (JJ important) (NN factor)) (PP (IN in) (NP (JJ colorectal) (NN cancer) (NN risk))))))) (. .)))
CYP1A1 catalyzes the bioactivation of a number of environmental and dietary procarcinogens, therefore differences in the activity or expression levels of this enzyme could be an important factor in colorectal cancer risk.
(ROOT (S (NP (NP (NNP Temperature)) (CC and) (NP (NN ph) (NN level))) (VP (VBP are) (ADJP (JJ important) (PP (IN in) (NP (NP (DT the) (NN activity)) (PP (IN of) (NP (DT an) (NN enzyme))))))) (. .)))