Brain surgeons use monkeys in China

Animal protectors, animal lovers, do no groan as you read:

Doctors from Renji Hospital are using monkeys as aides to conduct research on brain surgery. In the experiments carried out, they found out from monkeys that 10 minutes are the longest period a monkey can withstand a blocked blood supply to its brain without suffering effects or dying.

Apparently, SOME monkeys must have died along the way, since it is KNOWN after 10 minutes damage will be done.

Monkeys were used as their brains were similar in structure to those of humans. The experiment provided data useful in treatments to serious brain injuries, tumours and other human diseases.

Reality bites eh? To save ourselves, the endanger of others. Or rather, is it ethical?