As one of the most accomplished medical ninjas in the shinobi world, Tsunade's understanding of the human body might not have been unmatched, but it was certainly among the very best.
Moreover.
She was the First Hokage's granddaughter and understood his unique constitution far better than anyone else.
And now, based on the direct feedback from her medical chakra's examination...
The pure, vibrant nature of the chakra inside Yao, along with his extraordinary vitality...
It felt exactly the same as her grandfather's constitution!
Granted.
Because of his age.
Yao's vitality and chakra reserves couldn't yet compare to those of the First Hokage in his prime.
But the nature of their power was cut from the same mold.
Simply put, the difference was in quantity, not quality!
This made no sense!
How could a Uchiha possess the perfect constitution that should have belonged exclusively to the First Hokage?
Tsunade let go of his hand, her brows knitted tightly as she fixed Yao with a sharp gaze. Her voice carried an interrogative edge.
"Kid... have you undergone some kind of human body modification experiment? Orochimaru's? Or Danzo's Root?"
That was the most reasonable explanation she could think of.
Some kind of human experimentation had transplanted First Hokage Cells or related tissue into Uchiha Yao.
At that, Yao smiled. "You jest, Lady Tsunade!"
"You're a medical expert. Surely you can tell whether I've undergone human experimentation?"
Hearing this, Tsunade examined Yao again from head to toe, probing everything from his meridians to his cells with painstaking care.
Nothing!
There were no traces of artificial transplantation, sutures, or forced fusion.
Yao's chakra was incredibly pure!
It was perfectly unified, with no trace of chakra from an outside source.
At the cellular level, his body seemed like... a perfect whole that had been naturally harmonious