( ( at ( the uterus ) ) ( , ( estradiol ( ( can ( ( cause ( the ( endometrial lining ) ) ) ( to thicken ) ) ) . ) ) ) )
(ROOT (S (PP (IN at) (NP (DT the) (NN uterus))) (, ,) (NP (NN estradiol)) (VP (MD can) (VP (VB cause) (NP (DT the) (JJ endometrial) (NN lining)) (PP (TO to) (NP (NN thicken))))) (. .)))
at the uterus, estradiol can cause the endometrial lining to thicken.
(ROOT (S (NP (NNP Estradiol)) (VP (VBZ causes) (NP (DT the) (NN endometrium) (S (VP (TO to) (VP (VB thicken) (PP (IN during) (NP (DT a) (JJ menstrual) (NN cycle)))))))) (. .)))