| http://www.w3.org/ns/prov#value | - The reaction is conducted by adding an aqueous solution of cross-linking agent or a solution prepared by dissolving a cross-linking agent in a small amount of organic solvent such as N,N-dimethylformamide, dimethylsulfoxide, 1,2-dimethoxyethane, methanol, ethanol, acetone, etc. when the cross-linking agent is insoluble in water, to a solution prepared by dissolving an immunoglobulin or its fragmen
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