Another object of the present invention is to provide a method for modulating cytotoxicity of an antibody by modulating the plasma {TAIL ~ half life} of the antibody having cytotoxicity, an antibody with modulated cytotoxicity and a pharmaceutical composition, comprising the antibody, as well as {HEAD ~ a method} of preparing the antibody and the pharmaceutical composition 
Another object of the present invention is to provide a method for modulating cytotoxicity of an antibody by modulating the plasma { TAIL ~ half life } of the antibody having cytotoxicity , an antibody with modulated cytotoxicity and a pharmaceutical composition , comprising the antibody , as well as { HEAD ~ a method } of preparing the antibody and the pharmaceutical composition
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