Immune System
Which of the following(s) is/are the determinants of antigenicity?

All of these
Foreignness
Chemical nature
Size of the antigen

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

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

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