Jeff: Proposed regulations concerning the use of animals in scientific experimentation would prohibit experimentation on those species that humans empathize with: dogs and horses, for example.
Conclusion (Hence)
This proposal (to prohibit experimentation on those species that humans empathize with" should be extended to all experimentation on all mammals.
Evidence
Extensive neurological research on mammals shows that they are all capable of feeling pain.
Evaluate / Goal
We're trying to extend a prohibition to all mammals, so we need a rule whose trigger applies to these other mammals, and whose outcome sounds like or supports the language of "you can't do scientific experimentation on them".
So let's look for something like,
If they're capable → then can't of feeling pain experiment on them