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The L-series arrays utilize direct labeling for signal detection, wherein the antigen is tagged with biotin prior to incubation with the capture antibody. The signal is then developed with a streptavidin-conjugated HRP or fluor. Since this array requires only a single antibody per target molecule (as opposed to an antibody pair), any possibility of interactions between antibodies within the same array panel is eliminated. Thus, an unlimited number of antibodies may theoretically be included in each panel, making this array platform ideal for high-content screening of protein expression.The capture antibodies for L-Series may be spotted on either glass slide or membrane.