capable of capable of existence ends during protects immune system process fully formed stage anatomical system multicellular organism immune system ZFA:0001159 AAO:0011003 BILA:0000104 MA:0002711 SCTID:362590003 FMA:9825 GAID:328 uberon UBERON:0002405 MESH:D007107 OpenCyc:Mx4rvWNkm5wpEbGdrcN5Y29ycA BTO:0005810 VHOG:0001247 TAO:0001159 NCIT:C12735 Wikipedia:Immune_system UMLS:C0020962 XAO:0003152 The antibody-based immune system defined by the presence of the major histocompatibility complex (MHC), T cell receptor (TCR), B cell receptor (BCR) or recombination activating genes (RAGs) is known beginning from jawed fishes.[well established][VHOG] Anatomical system that protects the body from foreign substances, cells, and tissues by producing the immune response and that includes especially the thymus, spleen, lymphoid tissue, lymphocytes including the B cells and T cells, and antibodies.