The biochip 2 wherein {HEAD ~ the light blocking agent} is {TAIL ~ iron oxide} and wherein the cross linking agent is avidin or streptavidin 
is
The biochip 2 wherein { HEAD ~ the light blocking agent } is { TAIL ~ iron oxide } and wherein the cross linking agent is avidin or streptavidin
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH