(S (S (NP (BASENP (DT A) (NN number)) (PP (IN of) (BASENP (NNS studies)))) (VP (VBZ has) (VP (ADVP (RB recently)) (VP (VBN examined) (NP (NP (BASENP (DT the) (JJ possible) (NNS effects)) (PP (IN of) (BASENP (NN prayer)))) (COMMA ,) (PP (IN with) (BASENP (JJ mixed) (NNS results)))))))) (PERIOD .))