Immune System
Which of the following proteins would not need localization signal?

A nuclear protein
A protein bound to the endoplasmic reticulum (ER) membrane
A cytosolic protein
A cell surface protein

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

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