(S (S (S (VP (VBG Using) (BASENP (DT the) (NN computer) (NNS predictions)))) (COMMA ,) (S (BASENP (NNP Nicastro) (CC and) (NNS colleagues)) (VP (VBD searched) (PP (ADVP (RB specifically)) (PP (IN for) (NP (BASENP (DT the) (JJ diffuse) (NN system)) (PP (IN of) (NP (BASENP (NN gas) (NNS clouds)) (SBAR (S (NP (BASENP (NNS galaxies)) (CC and) (BASENP (NN galaxy) (NNS clusters))) (VP (VBP form) (PP (IN within))))))))))))) (PERIOD .))