(S (S (NP (BASENP (JJ South) (JJ Korean) (NNS scientists)) (PP (IN from) (NP (NP (BASENP (DT the) (NNP Korea) (NNP Research) (NNP Institute)) (PP (IN of) (BASENP (NNP Bioscience) (CC and) (NNP Biotechnology)))) (PP (IN in) (BASENP (NNP Daejeon)))))) (VP (VBP say) (SBAR (IN that) (S (NP (BASENP (DT the) (NN gene)) (PRN (COMMA ,) (NP (BASENP (NNP Vitamin) (NNP D3) (NNP Upregulated) (NNP Protein) (NNP 1)) (PRN (LRB -LRB-) (BASENP (NNP VDUP1)) (RRB -RRB-))) (COMMA ,))) (VP (VBZ spurs) (S (BASENP (NN stem) (NNS cells)) (VP (TO to) (VP (VB become) (BASENP (NN natural) (NN killer) (NNS cells)))))))))) (PERIOD .))