sentry

Immune cells act like vigilant sentries, moving through tissues and detecting remaining cancer cells that could lead to relapse.

Called 'Piranhas', the work includes spray-painted fish on a police sentry box in the City of London.

Even the death penalty isn't off the table - not just for murder or mutiny, but for damaging an oil or gas pipeline or a sentry caught sleeping on duty.

Early previews have been positive, but in today's unpredictable video games market you can't count your shurikens until they've knocked out a sentry in a perfect takedown, preferably millions of times.

The City of London Corporation said the other painted on 11 August - swimming piranhas on a City of London Police sentry box - had been taken to Guildhall Yard so it could be viewed safely.