( We ( ( believe ( it ( comes ( from ( ( ( the ( female prostate ) ) or ) ( ( ( the ( prostatic tissue ) ) , ) ( ( the ( ( glands and ) ducts ) ) ( that ( surround ( the urethra ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (VBP believe) (SBAR (S (NP (PRP it)) (VP (VBZ comes) (PP (IN from) (NP (NP (DT the) (JJ female) (NN prostate)) (CC or) (NP (NP (DT the) (JJ prostatic) (NN tissue)) (, ,) (NP (NP (DT the) (NNS glands) (CC and) (NNS ducts)) (SBAR (WHNP (WDT that)) (S (VP (VBP surround) (NP (DT the) (NN urethra))))))))))))) (. .)))
We believe it comes from the female prostate or the prostatic tissue, the glands and ducts that surround the urethra.
(ROOT (S (NP (DT The) (NN prostate) (NN gland)) (VP (VBZ secretes) (NP (PRP$ its) (NNS products)) (ADVP (RB directly)) (PP (IN into) (NP (DT the) (NN urethra))) (PP (IN through) (NP (JJ several) (JJ small) (NNS ducts))))))