(S (S (BASENP (NN Test) (NNS subjects)) (VP (MD will) (VP (VB be) (VP (VBN administered) (NP (BASENP (CC either) (DT a) (NN placebo) (CC or) (NN PA-457)) (SBAR (WHNP (WDT that)) (S (VP (MD will) (VP (VB be) (VP (VBN taken) (PP (IN in) (NP (BASENP (NN combination)) (PP (IN with) (NP (BASENP (DT the) (NN medication)) (SBAR (S (BASENP (PRP they)) (VP (ADVP (RB already)) (VBP take)))))))))))))))))) (PERIOD .))