despeciate

de·spe·ci·ate (')dē-'spē-s(h)ē-.āt vt, -at·ed; -at·ing to remove the characteristic antigenicity of (a foreign protein) by chemical or other treatment

de·spe·ci·a·tion (.)dē-.spē-s(h)ē-'ā-shən n

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de·spe·ci·ate (de-speґshe-āt) to undergo despeciation; to subject to (as by chemical treatment), or to undergo, loss of species antigenic characteristics.