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

Chemical nature
Foreignness
All of these
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 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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