(QT (DQL ``) (QTC (S (CC And) (S (BASENP (PRP we)) (VP (VBD discovered) (SBAR (IN that) (S (NP (NP (BASENP (NN insulin)) (CC and) (BASENP (PRPD its) (NN growth) (NNS factors))) (PRN (COMMA ,) (SBAR (WHNP (WDT which)) (S (VP (VBP are) (ADJP (JJ necessary) (PP (IN for) (NP (BASENP (DT the) (NN survival)) (PP (IN of) (BASENP (NN brain) (NNS cells))))))))) (COMMA ,))) (VP (VBP contribute) (PP (TO to) (NP (BASENP (DT the) (NN progression)) (PP (IN of) (BASENP (NNP Alzheimer) (POS 's))))))))))) (PERIOD .)) (DQR ''))