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