Preferred indicator dyes include {HEAD ~ reduction sensitive dyes} such as triphenyltetrazolium chloride, p tolyl tetrazolium red, tetrazolium violet, {TAIL ~ veratryl tetrazolium blue} and related dyes 
such as
Preferred indicator dyes include { HEAD ~ reduction sensitive dyes } such as triphenyltetrazolium chloride , p tolyl tetrazolium red , tetrazolium violet , { TAIL ~ veratryl tetrazolium blue } and related dyes
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH