Rare immune disease study aims to unlock t cell mysteries

This study is for people with idiopathic CD4 lymphocytopenia (ICL), a rare condition that causes low CD4 T cells and raises infection risk. Researchers will give participants and healthy volunteers two drugs to move stem cells from bone marrow into the blood, then collect them. The stem cells will be studied in mice and in lab tests to learn how T cells mature and travel in the body. The goal is to better understand ICL, not to treat it directly.