Competitive SELEX Strategy for High-Affinity Aptamer Isolation and Enhanced Biosensing.
Aptamers, with their high specificity and affinity, are invaluable for diagnostics and therapeutics. However, conventional SELEX (Systematic Evolution of Ligands by Exponential Enrichment) often favors abundant low-affinity sequences, limiting the isolation of rare, high-affinity candidates. To overcome this challenge,...