(S (S (BASENP (DT The) (NN finding)) (VP (VBD was) (VP (VBN made) (PP (IN by) (S (VP (VBG studying) (NP (NP (BASENP (DT a) (JJ genetic) (NN abnormality)) (PP (IN in) (BASENP (NNS rats)))) (SBAR (WHNP (WDT that)) (S (VP (VBZ blocks) (NP (BASENP (NN insulin) (NN signaling)) (PP (IN in) (BASENP (DT the) (NN brain)))))))))))))) (PERIOD .))