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							Nakao Ishida
														
									Department of Bacteriology, Faculty of Medicine, Tohoku University.
							
						 
						- 
							Ken Katagiri
														
									Department of Bacteriology, Faculty of Medicine, Tohoku University.
							
						 
						- 
							Reiko Chida
														
									Department of Bacteriology, Faculty of Medicine, Tohoku University.
							
						 
						- 
							Toyo Hataya
														
									Department of Bacteriology, Faculty of Medicine, Tohoku University.