Yes, not only revival experiments (which are far off) but stabilization experiments (which pay off in the here and now) are typically done on animals. No mice have ever been brought back from LN2 temperatures, but a rabbit kidney has been. For all we know, brains might be capable of survival (i.e. without nanorepair) under the best protocols, but this is not as easily testable as kidney function.
Yes, not only revival experiments (which are far off) but stabilization experiments (which pay off in the here and now) are typically done on animals. No mice have ever been brought back from LN2 temperatures, but a rabbit kidney has been. For all we know, brains might be capable of survival (i.e. without nanorepair) under the best protocols, but this is not as easily testable as kidney function.