Agarose gel electrophoresis of nine PCR-restriction fragment length polymorphism markers. The enzyme-digested PCR products were electrophoresed on a 2.5% agarose gel. KI-1, Korean isolate 1 of Toxoplasma gondii; RH, RH strain of T. gondii; M, 100 bp ladder molecular size marker. Lane 1, c22-8; lane 2, c29-2; lane 3, L358; lane 4, PK1; lane 5, SAG2; lane 6, BTUB; lane 7, GRA6; lane 8, SAG3; lane 9, Apico.