Agents use facial recognition, social media monitoring and other tech tools not only to identify undocumented immigrants but also to track protesters, current and former officials said. By Sheera ...

Here we have designed and synthesized ligands that specifically bind with high affinity (K d = 53 nM) to the guanine (G)–guanine mismatch, one of four types of single-nucleotide polymorphism (SNP).