(S (S (NP (BASENP (NNP Joan) (NNP Rose)) (PRN (COMMA ,) (NP (BASENP (DT a) (NP (BASENP (NN microbiologist)) (CC and) (BASENP (NN food) (NN safety) (NN expert)))) (PP (IN at) (BASENP (NNP Michigan) (NNP State) (NNP University)))) (COMMA ,))) (VP (VBD commented) (SBAR (IN that) (S (BASENP (PRP it)) (VP (VP (VBZ is) (RB not)) (VP (VBG surprising) (SBAR (IN that) (S (BASENP (NN cattle) (NN manure)) (VP (VBD was) (NP (BASENP (DT the) (NN source)) (PP (IN of) (BASENP (DT the) (NN infection))))))))))))) (PERIOD .))