Which of the following cytokine is expressed by T regulatory cells?

When an immature T-cell fails to productively rearrange its genes, which of the following happens?

A T-cell going through the selection process can:

Binding of B7 on a naive T-cell to CTLA-4 on a dendritic cell slows down activation and suppresses the cell from proliferating.

IL-4 is induced in a CD4 TH2 cell under the direction of the transcription factor _____.

Formation of the pre-TCR induces proliferation of thymocytes, during which the expression of RAG1 and RAG2 is maintained.

B7 is always present on the surface of the professional antigen presenting cells in high quantity so they can activate adaptive immune cells quickly.

If the _______ of a TCR is successfully rearranged, then the ________ is deleted and inactivated because of its location.

You would not expect to find dendritic cells nor macrophages in the thymus.

Which of the following is true about S1P?