The antigen or {HEAD ~ antibody} is mixed with {TAIL ~ a molten thermoplastic} and formed into the solid phase substrate  
is mixed with
The antigen or { HEAD ~ antibody } is mixed with { TAIL ~ a molten thermoplastic } and formed into the solid phase substrate
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH