Which of the following thymocytes could express two α chains? 

Both B-cells and T-cells have up to 4 potential attempts to productively rearrange their heavy chain and β-chain genes respectively.

Allelic exclusion at the α chain locus is tightly regulated and very rarely will a T-cell express a second α chain.

Central tolerance for T-cells takes place ________ activation and it takes place in the ________. 

Cytotoxic T-cells granular contents can induce apoptosis with which of the following cytotoxins in the granules?

Which T-cell/s are CD8 T-cells?

All of the following are professional antigen presenting cells except:

The expression of the pre-T-cell receptor is required in order to halt β-,γ-, and δ-chain rearrangements and induce proliferation of the thymocyte.

When the thymus fails to develop, the syndrome created is called:

The pre-TCR: