CD1C and adult T-cell leukemia/lymphoma: We found a large proportion of myeloid cells in our ATLL sample (1,181 of 15,550 total cells) and identified 4 subtypes (Figure 5A, C): macrophages with FTL, proliferating macrophages with STMN1, TAMs with MRC1 and MSR1, and DCs with CD1C.