( Semen ( ( is ( ( ( ( a mixture ) ( of sperm ) ) and ) ( ( the secretions ) ( of ( ( ( ( ( ( the ( seminal vesicles ) ) , ) ( prostate gland ) ) , ) and ) ( bulbaerethral glands ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Semen)) (VP (VBZ is) (NP (NP (NP (DT a) (NN mixture)) (PP (IN of) (NP (NN sperm)))) (CC and) (NP (NP (DT the) (NNS secretions)) (PP (IN of) (NP (NP (DT the) (JJ seminal) (NNS vesicles)) (, ,) (NP (NN prostate) (NN gland)) (, ,) (CC and) (NP (JJ bulbaerethral) (NNS glands))))))) (. .)))
Semen is a mixture of sperm and the secretions of the seminal vesicles, prostate gland, and bulbaerethral glands.
(ROOT (S (NP (DT The) (NN prostate) (NN gland)) (VP (VBZ secretes) (NP (NP (DT a) (NN fluid)) (SBAR (WHNP (WDT that)) (S (VP (VBZ mixes) (PP (IN with) (NP (NN sperm))) (S (VP (TO to) (VP (VB help) (NP (NN form) (NN semen)))))))))) (. .)))