(S (S (NP (NP (BASENP (NNP Edward) (NNP Lu)) (CC and) (BASENP (NNP Stanley) (NNP Love))) (PRN (COMMA ,) (PP (IN of) (NP (BASENP (NNP Johnson) (NNP Space) (NNP Centre)) (COMMA ,) (BASENP (NNP Houston)))) (COMMA ,))) (VP (ADVP (RB also)) (VP (VBP have) (VP (VBN allayed) (NP (BASENP (NNS fears)) (PP (IN about) (BASENP (DT a) (NN collision)))))))) (PERIOD .))