The invention provides a vehicle for {HEAD ~ colorimetric assay} which expands upon {TAIL ~ contact} with biological fluids 
The invention provides a vehicle for { HEAD ~ colorimetric assay } which expands upon { TAIL ~ contact } with biological fluids
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH