Indicate true (T) and false (F) statements below regarding the proteins of our adaptive immune system. Your answer would be a four-letter string composed of letters T and F only, e.g. TTFT.
( ) Both B cell receptors and T cell receptors have domains with an immunoglobulin fold, which consists of a ?-sandwich and an intrachain disulfide bond.
( ) MHC proteins are the most polymorphic among human proteins.
( ) MHC proteins and CD4 and CD8 co-receptors are all members of the Ig superfamily.
( ) Both B cell receptors and T cell receptors are stably associated with invariant transmembrane protein chains that are required for activating intracellular signaling pathways.