well as classical αβ t cells (their development of which is outlined above), a number of other t lineages develop in the thymus, including γδ t cells and natural killer t (nkt)cells. additionally, other non-t hematopoietic lineages can develop in the thymus, including b lymphocytes (b cells), natural killer lymphocytes (nk cells).), myeloid cells, and dendritic cells. however, the thymus is not a source of b, nkc, or myeloid development (this statement is not true for all b-cells or nkc). the development of these cells in the thymus reflects the multi-potent nature of hematopoietic progenitors that seed the thymus. mature b-cells and other apcs can also be found in the medulla which contribute to negative selection processes.