If a molecule of the type the sensor is designed to detect sticks to one of these anchored antibodies, it can also stick to an antibody on one of the free-floating outer channels.

ECONOMIST: Medical diagnostics

These trigger the degradation of another type of RNA molecule known as messenger RNA (mRNA), "down-regulating" the gene.

BBC: NEWS | Science/Nature | Salvage prospect for 'junk' DNA

Each type of atom or molecule absorbs particular colours.

ECONOMIST: Transits of Venus

They're trying to figure out whether the problems with torcetrapib come from lowering HDL cholesterol, lowering a particular type of HDL cholesterol, or from some unique characteristic of the torcetrapib molecule itself.

NPR: Deaths Prompted Withdrawal of Cholesterol Drug