Immunofluorescence (IF) is a powerful technique built on immunology, biochemistry, and microscopy techniques. The main principle is to use fluorescently labeled antibodies as probes for localization and qualitative analysis of specific antigens in tissues or cells. Because of its specificity, sensitivity, and speed, it is widely applied in scientific research (e.g. determination of endocrine hormones, proteins, peptides, nucleic acids, neurotransmitters, receptors, cytokines, cell surface antige