title: For Microscopy special feature on 'super resolution microscopy'.
authors.affiliation: Department of Applied Physics, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan fujita@ap.eng.osaka-u.ac.jp.
authors.forename: Katsumasa
authors.initials: K
authors.lastname: Fujita
authors.affiliation: Department of Cellular Neurobiology, Graduate School of Medicine, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: Shigeo
authors.initials: S
authors.lastname: Okabe