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

interleukin
HLA
CD8
actin

ANSWER DOWNLOAD EXAMIANS APP

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

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

ANSWER DOWNLOAD EXAMIANS APP