The Alexa Fluor® 546 goat anti-mouse IgG₁ is labeled with our bright, orange-fluorescent Alexa Fluor® 546 dye (which is spectrally similar to Cy3 dye) and is prepared from affinity-purified antibodies that react with the Fc portion of the heavy chain of mouse IgG₁. To minimize crossreactivity, the antibody has been adsorbed against mouse IgM, mouse IgA, pooled human sera, purified human paraproteins and mouse isotypes IgG_2a, IgG_2b and IgG₃ prior to labeling.