Positive selection is the mechanism that allows the host to retain T cells that recognize self MHC class I or MHC class II.

Allelic exclusion prevents the expression of B cell receptors that recognize self-antigens.

Senescence is a process which:

What is the sequence of immunoglobulin heavy and light chains rearrangement?

In general, the gene encoding the immunoglobulin light chain has a similar structure than the gene that encodes for heavy chains. However, unlike the heavy chain, the gene of immunoglobulin light chain:

Bonus Question: What does the the ABCDE acronym used to distinguish melanomas from other skin cancers and from normal moles stand for?

Where is this tissue found in the body? 

Bonus Question: Name the two ways epithelial tissues are classified.

Bonus Question:  Name this tissue: 

Name this tissue: