There is disclosed an optical information recordingreproducing apparatus for optically recording andor reproducing information in and from an optical recording medium. More specifically, selectin modulators and their use are described, wherein the selectin modulators that modulate a selectin-mediated function comprise particular glycomimetics alone or linked to a member of a class of compounds termed BASAs or a member of a class of compounds termed BACAs. The system includes at least two feeds for receiving beams from the main reflector and the subreflector.