( Sonogram ( of ( ( ( corpus ( ( luteum and ) follicles ) ) , ) mare ) ) )
(ROOT (S (VP (VB Sonogram) (PP (IN of) (NP (NP (NN corpus) (NN luteum) (CC and) (NNS follicles)) (, ,) (NP (NN mare)))))))
Sonogram of corpus luteum and follicles, mare
(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))))))) (. .)))