the endonuclease long thought to initiate mRNA decay in Escherichia coli, only works well on RNA with a 5′-monophosphate. Conversion of the 5′-triphosphate to a monophosphate now appears to be ...

Light and electron microscopy have distinct limitations. Light microscopy makes it difficult to resolve smaller and smaller ...

Light and electron microscopy have distinct limitations. Light microscopy makes it difficult to resolve smaller and smaller features, and electron microscopy resolves small structures, but samples ...