Intron Sequences from the CCT7 Gene Exhibit Diverse Evolutionary Histories among the Four Lineages within the Babesia microti-Group, a Genetically Related Species Complex That Includes Human Pathogens

1Laboratory Animal Science, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu 069-8501; 2Division of Experimental Animal Research, National Institute of Infectious Diseases, Tokyo 208-0011; 3Osaka Prefectural Institute of Public Health, Osaka 537-0023; 4Infectious Disease Surveillance Center, National Institute of Infectious Diseases, Tokyo 162-8640, Japan; and 5Division of Infectious Diseases, Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan, Republic of China