{TAIL ~ SELEX} is an acronym for Systematic Evolution of {HEAD ~ Ligands} by EXponential enrichment 
{ TAIL ~ SELEX } is an acronym for Systematic Evolution of { HEAD ~ Ligands } by EXponential enrichment
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH