Photo gallery
Mice are kept in groups of up to eight in these small cages
These mice were used in botox poisoning tests.
Mice were regularly found dead in the botox tests
Many mice suffer and die in the poisoning tests
Mice were killed by having their necks broken with a pen; sometimes their backs were broken instead
Dead mice were sealed in plastic bags and discarded
At the end of the test surviving mice were killed in this gas chamber
The dead mice were tipped into a bin
The test mice were kept in these small, barren cages
Hundreds of mice were used each week in the poisoning tests
