Additional file 1: Figure S1. of Genetic diversity of Mycobacterium tuberculosis isolates from Tochigi prefecture, a local region of Japan

Geographical location of Tochigi Prefecture in Japan. Tochigi is one of the inland prefectures of the Northern portion of the Kanto region. Its population on March 1, 2007, was 2,014,931 persons. The area of Tochigi prefecture is approximately 6,400 km2, making it the 20th largest in Japan, but the largest in the Kanto region. (PPTX 127 kb)