Certain reducible compounds are useful in analytical compositions, elements and {HEAD ~ methods}, e.g. for assays of {TAIL ~ bacterial cells} 
Certain reducible compounds are useful in analytical compositions , elements and { HEAD ~ methods } , e.g. for assays of { TAIL ~ bacterial cells }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL