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

recognize peptides not associated with MHC molecules
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

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Immune System
Which of the following is correct for isoantigens?

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

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