(S (S (NP (BASENP (NNS Researchers)) (PP (IN at) (BASENP (DT the) (NNP Massachusetts) (NNP General) (NNP Hospital)))) (VP (VBP have) (VP (VBN created) (NP (BASENP (JJ laboratory-grown) (NN rat) (NNS kidneys)) (SBAR (WHNP (WDT that)) (S (VP (VP (VBP function) (SBAR (WHADVP (WRB when)) (S (VP (VBN transplanted) (PP (IN into) (BASENP (NNS rats))))))) (PP (VBG according) (PP (TO to) (NP (BASENP (DT a) (NN study)) (VP (VP (VP (VBN published) (ADVP (RB online))) (BASENP (NN yesterday))) (PP (IN in) (BASENP (DT the) (JJ medical) (NN journal) (NNP Nature) (NNP Medicine)))))))))))))) (PERIOD .))