(S (S (NP (BASENP (NNP Dr.) (NNP Mark) (NNP Swain)) (PP (IN of) (BASENP (DT the) (NNP Jet) (NNP Propulsion) (NNP Laboratory)))) (VP (VP (VBD led) (NP (BASENP (DT another) (NN study)) (PP (IN of) (BASENP (NNP HD) (NN 209458) (NN b))))) (CONJP (COMMA ,) (CC and)) (VP (VBD found) (BASENP (JJ similar) (NNS results))))) (PERIOD .))