Thymocyte

Thymocytes (also known as T Cells) are a subdivison of white blood cells called Lymphocytes. They include Killer T Cells, Helper T Cells, Regulatory T Cells, and Memory T Cells. They differ from B cells because they mostly develop in the Thymus.

Life
Thymocytes start their lives in the Red Bone Marrow, then Naive T Cells migrate to the Thymus or the Tonsils.