Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain
the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in
Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles
and JavaScript.
President George Bush's plans for Mars will disappoint the enthusiasts, but they will not send the value of the US dollar into decline, for which everybody should be thankful.
Fivefold symmetry in the solid state remains a puzzle, if only because credible realizations are statistically special structures. But now it seems likely that they are not so special.
The retroviral Gag protein can be used to package recombinant proteins produced by mammalian cell cultures. Protein products can then be isolated easily from the recombinant virions.
A gun for firing DNA into plant cells, a disposable bioreactor and hollow-fibre membrane purification systems top this week's offerings for biotechnology.
