Electrophoretic examination of multiplex PCR products. Lane M, 1 kb plus DNA ladder (Life Technologies, Rockville, ME, U.S.A.); lane 1, S. mitis KCTC 3556T; lane 2, S. pneumoniae KCTC 5080T; lane 3, S. oralis KCTC 13048T; lane 4, S. mitis KCTC 3556T plus S. pneumoniae KCTC 5080T; lane 5, S. mitis KCTC 3556T plus S. oralis KCTC 13048T; lane 6, S. pneumoniae KCTC 5080T plus S. oralis KCTC 13048T; lane 7, S. mitis KCTC 3556T plus S. pneumoniae KCTC 5080T plus S. oralis KCTC 13048T.