text:  MEChi.GFP+.Adult.KO#3 Thymic Medulla_MEChi.GFP+.Adult.KO genetic background: C57BL/6; gender: Mixed; age: 5 Weeks; tissue: Thymic Medulla; exclusion markers: CD45- Ly51-; phenotype markers: CD45- Ly51- MHCIIhi GFP+; separation method: MoFlo Sorter