. "Any process that mediates the transfer of information from an epiblast cell to an extraembryonic ectoderm cell that contributes to the specification of the anterior/posterior axis." . . . "epiblast cell-extraembryonic ectoderm cell signaling involved in anterior/posterior axis specification" . "epiblast cell-extraembryonic ectoderm cell signalling involved in anterior/posterior axis specification" . . .