Molecular beacons, single-stranded oligonucleotides that have a fluorescent "reporter" group at one end and a fluorescence "quencher" at the other, do not suffer from these shortcomings. 1 When free ...

Day 19 of the 2024 Space Telescope Advent Calendar: a beacon in the clouds ... This particular image focuses on one of the three giant molecular cloud complexes, dubbed N79 South.