(S (S (S (NP (BASENP (NNS Researchers)) (PP (IN with) (NP (NP (BASENP (DT the) (NNP University)) (PP (IN of) (BASENP (NNP Calgary)))) (PP (IN in) (BASENP (NNP Canada)))))) (VP (VBP have) (VP (VBN found) (SBAR (IN that) (S (NP (BASENP (NN prolactin)) (PRN (COMMA ,) (NP (BASENP (DT a) (NN hormone)) (VP (VBN produced) (PP (IN during) (BASENP (NN pregnancy))))) (COMMA ,))) (VP (MD may) (VP (VB reverse) (NP (BASENP (DT the) (NN progression)) (PP (IN of) (NP (BASENP (JJ multiple) (NN sclerosis)) (PRN (LRB -LRB-) (BASENP (NN MS)) (RRB -RRB-)))))))))))) (COMMA ,) (PP (VBG according) (PP (TO to) (NP (BASENP (DT a) (NN paper)) (VP (VP (VBN published) (BASENP (DT this) (NN week))) (PP (IN in) (NP (BASENP (DT The) (NN Journal)) (PP (IN of) (BASENP (NN Neuroscience)))))))))) (PERIOD .))