The invention provides means and methods for inhibiting a biological activity of cells. In one embodiment the invention is concerned with a method of inhibiting a biological activity in a first or second cell mediated by the binding of two membrane proteins that are binding partners for each other. The mentioned biological activity is inhibited by providing the cells with an antibody or antibody like molecule that can bind to each of the mentioned binding partners and the binding blocks the binding of the two binding partners thereby inhibiting the mentioned biological activity.本發明提供抑制細胞的生物活性的手段和方法。在一實施例中，本發明有關於抑制第一或第二細胞中，由彼此為結合配偶體的兩個膜蛋白質的結合所介導的生物活性的方法。藉由對細胞提供可結合至每個所提及的結合配偶體結合的抗體或類抗體分子，來抑制所提及的生物活性，且前述結合阻斷這兩個結合配偶體的結合，從而抑制所提及的生物活性。
