What does the structure and function of thymus include?
A.
Thymic epithelial cells secrete thymopoietin d
B.
Thymus cells in the cortex are denser than those in the medulla
C.
No mature thymus cells in the medulla
D.
Only about 2% of all developing T lymphocytes survive to exit the thymus as immunocompetent T cells.
E.
Barrier structure between blood and thymus medulla