(S (S (NP (BASENP (NN Study)) (PP (IN of) (NP (BASENP (DT the) (NNS teeth)) (PP (IN from) (BASENP (DT the) (NNS skeletons)))))) (VP (VBZ indicates) (SBAR (IN that) (S (NP (BASENP (RB about) (NN half)) (PP (IN of) (BASENP (PRP them)))) (VP (VBD were) (PP (IN from) (PP (IN outside) (BASENP (DT the) (NN area))))))))) (PERIOD .))