(S (S (ADVP (RB Additionally)) (COMMA ,) (S (BASENP (PRP they)) (VP (VBD determined) (SBAR (IN that) (S (NP (BASENP (DT a) (NN drop)) (PP (IN in) (NP (BASENP (NN insulin) (NN production)) (PP (IN in) (BASENP (DT the) (NN brain)))))) (VP (VBZ contributes) (PP (TO to) (NP (BASENP (NN brain) (NN cell) (NN degeneration)) (COMMA ,) (NP (BASENP (DT a) (NN symptom)) (PP (IN of) (BASENP (NNP Alzheimer) (POS 's)))))))))))) (PERIOD .))