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