What is the function of auxiliary cells?

Auxiliary cells, also known as helper T cells or CD4+ T cells, play a crucial role in the immune system by attracting leukocytes to infection sites. When a pathogen is detected, these cells help coordinate the immune response by releasing signaling molecules called cytokines. These cytokines serve as chemical messengers that stimulate other immune cells, like leukocytes (white blood cells), to migrate to the site of infection. This recruitment is essential for mounting an effective immune response, as it ensures that additional immune mechanisms are brought to bear against invading pathogens. The function of auxiliary cells in attracting leukocytes emphasizes their role in orchestrating the body's defense against infections, making this the correct choice in the context of the question.