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 associated with MHC class I molecules
recognize peptides not associated with MHC molecules

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Immune System
Which of the following is correct for isoantigens?

They are antigens found in some members of a species
They are antigens found in all members of different species
They are antigens found in all members of a species
They are antigens found in some members of different species

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