by Janie — Pseudouri­dine, an iso­mer of uri­dine, is per­haps now most widely known for its crit­i­cal role in the suc­cess of the COVID-19 mRNA vac­cines. Three years ago on STC, Roberto wrote an ap­pre­cia­tive note about this key fea­ture of the vac­cines, the N1-methyl­pseudouri­dine that acts a bit like an in­vis­i­bil­ity cloak...