{HEAD ~ The liquid reagent} 17 is then squirted directly onto {TAIL ~ the portion} of the test pad 12 bearing the first reagent 13 
is squirted directly onto
{ HEAD ~ The liquid reagent } 17 is then squirted directly onto { TAIL ~ the portion } of the test pad 12 bearing the first reagent 13
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH