( ( ( menstruation , ) ( follicle ( formation ( , ( ovulation ( , ( corpus ( luteum 78 ) ) ) ) ) ) ) ) . )
(ROOT (NP (NP (NN menstruation)) (, ,) (NP (JJ follicle) (NN formation) (, ,) (NN ovulation) (, ,) (NNP corpus) (NN luteum) (CD 78)) (. .)))
menstruation, follicle formation, ovulation, corpus luteum 78.
(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))))))) (. .)))