Another dimension of complexity results from the differential binding and adhesion behavior of human tumor cells to murine vs. human P-selectin under static and dynamic experimental conditions, respectively: while all tested human tumor cells bound human and murine P-selectin under static conditions, only sLeA+/X+ and sLeX+ cells (but not sLeA-/sLeX- cells) were able to adhere dynamically on murine P-selectin. This evidence concerns the gene SELP and neoplasm.