{HEAD ~ The dyes} of the invention optionally possess {TAIL ~ a reactive group} useful for preparing fluorescent conjugates, which conjugates and methods for their preparation are described herein 
optionally possess
{ HEAD ~ The dyes } of the invention optionally possess { TAIL ~ a reactive group } useful for preparing fluorescent conjugates , which conjugates and methods for their preparation are described herein
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH