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

HLA
CD8
interleukin
actin

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Immune System
T cell receptors (or TCR) on CD4+ T cells

recognize peptides associated with MHC class I molecules
recognize peptides associated with MHC class II molecules
recognize peptides not associated with MHC molecules
are secreted out into the environment to bind antigens

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