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CD205, also known as DEC-205, is a type I C-type lectin receptor and a member of the macrophage mannose receptor family. It is primarily expressed on dendritic cells （DCs）, cortical thymic epithelial cells, and some leukocyte sub-populations. This receptor is involved in antigen uptake, processing, and presentation, playing a crucial role in the immune system. CD205 has a unique pH-dependent conformational change, allowing it to efficiently capture and internalize antigens in an acidic environment. Due to its high antigen-presenting efficiency, CD205 is widely used in immunotherapy, particularly in the development of antiviral and antitumor vaccines.