In my opinion, it is not humanitarian at all to take any animal experiment. Since their lives will get hurt and killed anyway when it comes to the pre-clinical research and people just wanna get rid of the germs,toxins or any contagions they put inside the animal’s bodies in simplest ways. So it’s not a problem of whether some animals should die for that and some other shouldn’t, it’s how to compromise a safe, harmless, meanwhile cheap and appropriate method that works for both human and the experiment animals. I do have a wish on this hopefully one day this could be approached by either a huge breakthrough on the control of cell differentiation, or completely computer-based simulations of the in vivo environment.