Because the word "model" is very overloaded. In this context, it means something like http://www.bio.umass.edu/biology/kunkel/modelsys.html http://www.bio.umass

Because the word "model" is very overloaded. In this context, it means something like http://www.bio.umass.edu/biology/kunkel/modelsys.html http://www.bio.umass.edu/biology/kunkel/modelsys.html So yeah, it sucks that when you read a headline, you don't know if it's talking about an animal model, an in vitro model, a computational model, or something in between. But that's how it is. They're all models.