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This was learned only later.
In subsequent experiments, Yawgmoth's protocol led to sporadic deaths among the primate test subjects, and these cases of death were largely due to the slow speed of brain transformation, unable to keep pace with the body's conversion.
But these were just isolated incidents.
Most primates could survive this period by relying on standard cooling methods and live on successfully.
There were only two issues.
The first was that the cognitive abilities of monkeys are far inferior to that of humans. Even if there was minor damage to the higher parts of the brain, it would not be immediately evident.
And the second point...
As a top geneticist, Yawgmoth overlooked a physiological perspective.
The complexity and energy consumption of the human brain are far greater than those of other primates.
So much had been sacrificed for this brain.
