( ( Can ( ( ( transport substances ) `` ) up ) ) ( '' ( ( their concentration ) ( gradient . ) ) ) )
(ROOT (S (SQ (MD Can) (VP (VB transport) (NP (NNS substances)) (`` ``) (ADVP (RB up)))) ('' '') (NP (PRP$ their) (NN concentration)) (VP (VBP gradient)) (. .)))
Can transport substances &quot;up&quot; their 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)))))) (. .)))