. "Any process that modulates the frequency, rate or extent of the directed movement of iron ions (Fe) from one side of a membrane to the other by means of some agent such as a transporter or pore." . . . "regulation of iron ion transmembrane transport" . "regulation of transmembrane Fe transport" . "regulation of transmembrane iron ion transport" . "regulation of transmembrane iron transport" . . . . . . . . . . .