peyer`s patches lymphoid-tissue in the human body part of the immune system 3d close-up

action activated activation anatomy antibody antigen apc bacteria blood body cancer care cell dendrite detail education graphics health healthcare human illustration immune immunity killer leukocyte lymph lymphocyte lymphoid macrophage medical myeloblast nerve nervous neuron node pathogens phagocyte phagocytosis progenitor receptor research response science stem structure system tissue white