This paper describes precise processing techniques of a single biological cell by using laser beams. A laser beam is focused to the order of its wavelength on the cell membrane or the microorganisms. This non-contact and precise biological cell micro-processing technique is mainly used for the injection of foreign substances such as DNA into cells and for cell fusion. In particular the laser induced cell fusion method has several advantages over other conventional fusion techniques. Our recent

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... esults of cell fusion experiments including all optical schemes incorporating with optical trapping are reported and discussed.