Methods are provided for isolating CD8+ T cells. Furthermore, methods for purifying a subset of IL-13 expressing CD8 T cells are provided, such methods comprising the steps of marking the CD8+ T cells by labeling CD8, or selectively removing non-CD8 cells, and then purifying a subset of IL-13 expressing CD8+ T cells by marking a human biomarker such as C10orf128. Related antibodies and antiserums are also described, such antibodies related to a cell surface domain peptide for biomarker C10orf128, and human homologs of related mouse activated CD8IL-13 cell surface biomarkers Tm4sf19 and 1830127L07Rik.