(S (BASENP (NNP Choi)) (VP (VBZ calls) (NP (BASENP (DT this)) (QT (DQL ``) (QTC (NP (BASENP (DT the) (JJ first) (NN step)) (PP (IN toward) (S (VP (VBG developing) (NP (NP (BASENP (JJ new) (NNS treatments)) (VP (VBG using) (BASENP (PRPD our) (JJ own) (NN immune) (NN system)))) (SBAR (S (VP (TO to) (VP (VB fight) (NP (BASENP (NNS cancers)) (CC and) (BASENP (JJ other) (JJ serious) (NNS diseases)))))))))))) (PERIOD .)) (DQR '')))))