Background : Recently, it has been suggested that autoantibodis face of melanocytes are prevent in the sera of vitiligo patients. However, these autoantibodies exist, whether they are specific for vitiligo a vitiligo patients possess them. In addition, the specificity of the iti lecular weight of the antigen are all unsolved areas demanding further. Objective : To investigate the possible role of autoimmune microvitiligo, this study was designed to verify the presence of auto and vitiligo antigen from the surface of melanocytes, the specificity of gene specific antigens on the sunever, it is not known whether ents, and what percentage of goantigen and the exact moier research. anisms in the development of bodies in vitiligo patients, the utoantibodies and vitiligo anti. Methods : Indirect immuvofluorescent microscopy, flow cytoriiety, and ELISA was done to compare the reactions between melanocytes and sera. SDS-PAC island immunoblotting were used for the identification of vitiligo antigen. Results : Vitiligo sera showed more prominent fluorescence and higher optical density on the surface of melanocytes than normal sera. Forty-four percent of vitiligo sera was directed to melanocytic surface antigen with a molecular weight of 65kDa. The sition assay using rabbit antimelanocytic antibody showed an inhibition of the reaction betw er vitiligo sera and melanocytes in ELISA and immunoblotting. Conclusion : A surface antigen of 65kd was identified from melanocytes and 44.4% of the vitiligo sera showed positive reactions to this antigen. (Kor J Dermatol 1995;33(2): 248-259)