A pro-T cell that has the phenotype CD4-negative, CD8-negative, CD44-positive, and CD25-negative. [ GOC:add http://purl.obolibrary.org/obo/go/references/0000031 GOC:tfm ]

Synonyms: DN1 thymic pro-T-cell double negative 1 preT.DN1.Th DN1 thymic progenitor T cell DN1 thymocyte DN1 thymic pro-T lymphocyte DN1 thymic pro-T-lymphocyte