Positive Samples: Mouse plasma Immunogen sequence: IHRGWLLLQV SSRVFMEGEP LALRCHAWKD KLVYNVLYYR NGKAFKFFHW NSNLTILKTN ISHNGTYHCS GMGKHRYTSA GISQYTVKGL QLPTPVWFHV L. FCGR1B may bind to the Fc region of immunoglobulins gamma with a low affinity compared to