The single cell transcriptome of MF cells isolated from cutaneous lesions, however, suggests additional phenotypes: in 4 patients MF cells expressed genes associated with memory T cells such as CD27, CCR7 and IL7R, whereas in 3 patients we observed gene signatures typical for cytotoxic T cells, including expression of GZMA, NKG7 and GNLY (3). This evidence concerns the gene CD27 and mycosis fungoides.