 ILT7 and BDCA-4 are also expressed on human pDC surfaces, although their signaling pathways are still obscure.However, there are speculations that the interaction between ILT7 and BST2 may have a negative regulatory effect on the cell’s interferon production.Unlike myeloid dendritic cells, myeloid antigens like CD11b, CD11c, CD13, CD14 and CD33 are not present on pDC surfaces.