<prompt> Non professional antigen presenting cell is AE ?Endothelial cellEpidermal cellFibroblastsRed blood cells  <response>: Ans. is d i.e., Red blood cells Non-professional antigenpresenting cell A non-professional APC does not constitutively express the Major Histocompatibility Complex class II MHC class II proteins required for interaction with naive T cells; these are expressed only upon stimulation of the non? professional APC by ceain cytokines such as IFN-y. All nucleated cells express the Major Histocompatibility Complex class I necessary to be considered a nonprofessional APC. As erythrocytes do not have a nucleus, they are one of the few cells in the body that cannot display antigens. 