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Map of Korea showing the studied regions where horse blood samples were collected. The provinces of Gyeonggi (GG) and Gangwon (GW) are classified as northern; the provinces of Chungbuk (CB), Chungnam (CN), Jeonbuk (JB), and Gyeongbuk (GB) as central; the provinces of Jeonnam (JN) and Gyeongnam (GN) as southern; and the province of Jeju island as Jeju-do (JJ).
