One basis for Xolair's patent, as well as its most important property, is that it will not come into contact with IgE that has already bound to ligands on the surface of cells, and therefore will not trigger an allergic reaction.
抗體藥物「索雷爾」的專利、亦即最重要的特性就在於──它不會去碰觸已與細胞表面「結合子」結合的 IgE，因此沒有引發過敏反應之虞。