All life is built from 'the big six',

(or so we used to think)

A C-H-O-N-P-S mix:

Each wasp and shrub and skink.

Arsenic is quite like P,

But drinking it's a no-no

Except for this twig on life's tree:

Bacteria in Mono!

The proteins, lipids, DNA

of Halomonadaceae

Are full of arsenic, they say ...

It makes them grow like crazy!

http://www.sciencemag.org/content/early/2010/12/01/science.1197258