be made up of two arms: innate and adaptive. However, this is a simplification because these arms have overlapping functions and are tightly related. Dendritic cells, Natural Killer cells (NK), macrophages, neutrophils, eosinophils, basophils, and mast cells are all part of the innate immune system. Innate immune cells are the initial line of defence against foreign antigens and do not require antigen stimulation. B lymphocytes, CD4+ helper T lymphocytes, and CD8+ Cytotoxic T Lymphocytes (CTLs) make up the adaptive immune system, which is activated by Antigen-Presenting Cells (APCs).
Julia Anderson
Cellular & Molecular Medicine: Open access received 187 citations as per google scholar report