Immune System
Macrophages are professional antigen- presenting cells. The protein molecule through which they present antigen in human is

interleukin
actin
HLA
CD8

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Immune System
Polymorphonuclear leukocytes (or PMNs)

can be attracted to the site of an infection following activation of complement
All of these
are derived from bone marrow stem cells
are a type of phagocyte that can engulf and kill bacteria

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