Immune System
Which is not an antigen-presenting cell (or APC)?

All of these
Dendritic cell
B cell
Polymorphonuclear leukocyte (or PMN)

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

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