The human leukocyte antigen DM (HLA-DM) is a crucial molecule involved in the immune system. HLA-DM plays a significant role in peptide presentation to T cells by facilitating peptide loading onto major histocompatibility complex (MHC) class II molecules. Additionally, HLA-DM function is vital for the effective activation of CD4+ T cells, which are integral to orchestrating an immune response. Which is correct?