( ( Define ( ( ( a follicle ) and ) ( a ( corpus luteum ) ) ) ) . )
(ROOT (S (VP (VB Define) (NP (NP (DT a) (NN follicle)) (CC and) (NP (DT a) (NN corpus) (NN luteum)))) (. .)))
Define a follicle and a corpus luteum.
(ROOT (S (NP (NP (DT The) (NNS cells)) (PP (IN in) (NP (DT the) (NN follicle)))) (VP (VP (VBP undergo) (NP (JJ physical) (NNS changes))) (CC and) (VP (VBP produce) (SBAR (S (NP (DT a) (NN structure)) (VP (VBD called) (NP (DT a) (NN corpus) (NN luteum))))))) (. .)))