develops from OBO_REL:part_of (UNDECLARED) thymus common lymphocyte progenitor pro-T cell A progenitor cell of the T cell lineage, with some lineage specific marker expression, but not yet fully committed to the T cell lineage. CL:0000827 DN1 cell DN1 thymocyte T lymphoblast TAO:0009350 TN1 cell pro-T lymphocyte teleost_anatomy lymphoid progenitor cell