Where Do Lab Rats Come From?

Where do the white lab rats and mice come from? Think about it. Are they some sort of snow rodents? I don’t think so. They are probably some sort of genetic anomalies. I think scientists should have to note that fact in their findings. Instead of reading something like, “Scientists find that excessive caffeine causes cancer in lab mice” – the report should read, “Scientists find that excessive caffeine causes cancer in genetically altered rodents.” Makes a difference on your reaction doesn’t it?