lacks_plasma_membrane_part has plasma membrane part develops from DN3 thymocyte DN4 thymocyte Note that this type of thymocyte has passed the beta-selection checkpoint and is rapidly proliferating and beginning to rearrange the T cell receptor alpha chain. There is growing evidence that molecular markers characterizing double negative thymocytes are different across species, especially in mouse versus human thymus. If in doubt, please consider using CL:0002489 'double negative thymocyte'. thymocyte double negative thymocyte pre-T cell receptor complex CD4 molecule CD44 molecule interleukin-2 receptor subunit alpha T cell receptor co-receptor CD8