Referring to FIGS 4L and M a similar system is possible but instead of a polymer leuco and reducing groups may be attached to oppositely charge microspheres directly by {HEAD ~ means} of {TAIL ~ a bridge} 296 which may be a biotin streptavidin bridge, polymer bridge or any other suitable bridge 
of
Referring to FIGS 4L and M a similar system is possible but instead of a polymer leuco and reducing groups may be attached to oppositely charge microspheres directly by { HEAD ~ means } of { TAIL ~ a bridge } 296 which may be a biotin streptavidin bridge , polymer bridge or any other suitable bridge
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH