( ( Platelets ( -- ( ( ( small ( cell fragments ) ) , ) ( help form ) ) ) ) ( a ( blood clot ) ) )
(ROOT (NP (NP (NNS Platelets)) (PRN (: --) (NP (NP (JJ small) (NN cell) (NNS fragments)) (, ,) (NP (NN help) (NN form)))) (NP (DT a) (NN blood) (NN clot))))
Platelets--small cell fragments, help form a blood clot
(ROOT (S (NP (NNS Platelets)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (NP (DT the) (NN cell) (NNS fragments)) (VP (VBN involved) (PP (IN in) (NP (NP (NN blood) (NN clotting)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBP stick) (PP (PP (TO to) (NP (NP (NNS tears)) (PP (IN in) (NP (NN blood) (NNS vessels))))) (CC and) (PP (TO to) (NP (DT each) (JJ other)))))))))))))) (. .)))