Which subsets are included under HLA-II?

HLA class II molecules are critical components of the immune system, primarily involved in presenting antigens to CD4+ T-helper cells. The specific subsets included under HLA class II are DR, DP, and DQ.

These subclasses are essential for various immune responses. Each of these molecules plays a unique role in the presentation of peptides derived from extracellular proteins to T cells, which is vital for initiating appropriate immune responses. The HLA-DR molecule is often the most studied due to its association with various autoimmune diseases, while HLA-DP and HLA-DQ also have important functions in immune regulation and disease susceptibility.

The other choices presented do not correspond to recognized subclasses of HLA class II molecules, making them incorrect in the context of this question. Understanding these specific subsets highlights the complexity and specificity involved in immune system functioning, allowing for tailored immune responses to pathogens.