11561-FC) with an ED₅₀ of 0.100-1.00 ng/mL." class="big_lightbox"> 11561-FC) with an ED₅₀ of 0.100-1.00 ng/mL." alt="Measured by its binding ability in a functional ELISA. Recombinant Human IgE Fc His-tag Protein (Catalog # 11647-IE) binds to Recombinant Human Fc epsilon RI alpha Fc Chimera Protein ( 11561-FC) with an ED₅₀ of 0.100-1.00 ng/mL." class="big_thumb" />