(S (S (BASENP (DT These) (NNS findings)) (VP (VBD were) (VP (ADVP (RB first)) (VP (VP (VBN published) (PP (IN in) (NP (BASENP (DT the) (NN journal) (NNS proceedings)) (PP (IN of) (NP (NP (BASENP (NNP United) (NNPS States) (NNP National) (NNP Academy)) (PP (IN of) (BASENP (NNPS Sciences)))) (PRN (LRB -LRB-) (BASENP (NNP NAS)) (RRB -RRB-))))))) (PP (IN on) (BASENP (NNP Monday))))))) (PERIOD .))