Argument: Differences between humans and animals can be accounted for in tests
"Animal Experiments". BBC.co.uk. Updated August 17th, 2004 - "Scientists claim there are no differences in lab animals and humans that cannot be factored into tests."
Coalition for Medical Progress. FAQ - "Even if we share many genes our brains are totally different to animals. How can you find out anything about our brains from animal brains? There are differences, there are also similarities. Science rarely tries to mimic a whole human disease in an animal. Instead it focuses on one part of the disease that can be seen in the animal (Philip Connolly, CMP)"