Immature DCs uptake, process antigens and present antigen peptides to MHC. Only in this way, can Ags be recognized by TCR on T cells.

• 未成熟DCs能摄取抗原并将其处理成免疫原性多肽，以MHC分子-抗原肽复合物的形式表达于细胞表面，供抗原特异性T细胞受体(TCR)识别。