( ( Resistance ( of ( parasites ( to ( multiple ( therapeutic drugs ) ) ) ) ) ) ( ( involves ( ( a ( membrane protein ) ) ( which ( is ( capable ( of ( ( ( transporting ( the drugs ) ) out ) ( of ( ( the cell ) ( against ( a ( concentration gradient ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NN Resistance)) (PP (IN of) (NP (NP (NNS parasites)) (PP (TO to) (NP (JJ multiple) (JJ therapeutic) (NNS drugs)))))) (VP (VBZ involves) (NP (NP (DT a) (JJ membrane) (NN protein)) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADJP (JJ capable) (PP (IN of) (S (VP (VBG transporting) (NP (DT the) (NNS drugs)) (PRT (RP out)) (PP (IN of) (NP (NP (DT the) (NN cell)) (PP (IN against) (NP (DT a) (NN concentration) (NN gradient)))))))))))))) (. .)))
Resistance of parasites to multiple therapeutic drugs involves a membrane protein which is capable of transporting the drugs out of the cell against a concentration gradient.
(ROOT (S (NP (JJ Primary) (JJ active) (NN transport)) (VP (VBZ involves) (NP (NP (DT the) (NN forcing)) (PP (IN of) (NP (DT a) (NN substance)))) (PP (IN into) (NP (NP (DT a) (NN cell)) (PP (IN against) (NP (PRP$ its) (NN concentration) (NN gradient)))))) (. .)))