['IL-15 can either be transpresented by IL-15Rα or be secreted.', 'New N- and C-terminal splice versions of human IL-15Rα determine whether IL-15 is secreted or stays bound to the cell membrane.'] Are paracrine and transpresentation functions of IL-15 mediated by diverse splice versions of IL-15Rα in human monocytes and dendritic cells?