After discussing medical skills for almost a week, Tsunade felt that it was almost done. Although she wanted to continue, she still had to teach Himoyuki medical ninjutsu. In the past half month, Himoyuki's clones were not idle either. She continued to practice Moon Shining and ejecting Bagua empty palms with her fingers. She did not fall for her eye exercises and listening to voice and defending positions.

"Hi Yue, today I officially teach you medical ninjutsu!" Tsunade said to Hiro Yue with a smile.

"Okay, Master." Riyue had been waiting for this day for a long time.

"I communicated with you for so long a few days ago. You also know that in addition to the changes in the five basic attributes, chakra also has changes in the attributes of yin and yang. "Yin" refers to the changes in chakra dominated by spiritual energy, while 'yang' is the changes in chakra dominated by physical energy."

"The chakra of your Hinata family is generally without attributes. Although there are no changes in the five major attributes, it can produce changes in the yin and yang attributes. Because although the yin and yang changes in chakra are difficult, they are linked to the fundamental nature of chakra: 'Chakra is a combination of spiritual energy and physical energy' this essence will not change."

"The so-called Yin Dun means using spiritual energy to create a material image from 'nothing'. For example, the [Shadow Imitation Technique] of the Nara clan gives shadow entities without substance. And Yang Dun means using physical energy to inject 'chakra' or 'will' into 'matter', so that it has similar vitality. Simply put, it is injecting life into the material image. For example, the [Bizing Technique] of the Akidao clan belongs to Yang Dun."

"Well, master, you have told me." Riyue said. This chakra theory is somewhat similar to Tai Chi Yin-Yang theory, so it is easy for Sun and Moon to understand.

"The basis of medical ninjutsu is the change in the nature of chakra. For example, using chakra with positive attributes to stimulate the cells of the injured, so that the cells can accelerate division and growth, thereby achieving the purpose of healing wounds; injecting chakra with a large amount of body energy into the cells can quickly activate damaged and dead cells, and repair and restore vitality by themselves; releasing a large amount of chakra with positive attributes to make them flow in the body, causing the cells to divide and regenerate at an extremely fast speed; and even directly inject vitality into patients with injuries!"

"So medical ninjutsu requires very precise chakra control. If chakra is not well controlled, it will cause cell rupture and death. Chakra will act too slowly on cells, and will recover too slowly. If it works too fast, it will be easy to make mistakes. You must be able to control every minute of chakra as you wish!"

"I understand, master!" Riyue nodded, and he liked the exact operation the most.

"Okay, now practice the positive changes in chakra first." Tsunade began to teach Sun and Moon.

Ninja controls chakra into several types. The most basic ones include: controlling the dosage, flow, distribution, characteristics and functions of chakra, etc. Advanced control techniques are the morphological changes of chakra and the changes in the nature of chakra. For example, the chakra needle used in the acupoint of the Sun and Moon Fur Fist is a simple morphological change of chakra.

To make yin and yang changes in chakra is to make the extracted chakra show the properties of "body energy" or "spiritual energy", which belongs to the advanced nature changes of chakra.

The yin and yang changes are related to the mixing ratio of the two energies in the chakra themselves. Due to the differences in individuals, some people have strong physical energy, such as Ding Zuo, whose chakra has slightly more physical energy than mental energy, and chakra has a yang attribute. Some people have strong spiritual energy, such as Lu Jiushi, and his chakra has more spiritual energy than physical energy, so his chakra has a yin attribute. Just like Tsunade Hime is a Thousand Hand clan, with strong vitality and physical energy, she will achieve twice the result with half the effort when using Yang to escape.

Because of the time travel, Sun and Moon have a reincarnation eye, and his spiritual energy is stronger than that of ordinary people. On the other hand, the immortal body of Sun and Moon has strong vitality and its physical energy is far more than that of ordinary people. Therefore, Sun and Moon’s chakra is basically neutral, and the mixture of the two energies is quite even.

If the mental energy and physical energy condensed by oneself are the best ratio, such chakra is not only pure, but will not favor any attribute. It is also very beneficial for the immortal chakra to perfectly achieve a 1:1:1 balance between the three after turning on the [Immortal Mode] into natural energy.

When a person uses ninjutsu, the mental energy in the chakra is consumed as much as the physical energy. When using illusion, the energy mix of chakra is still 55% ratio, but the mental energy in chakra is consumed more. Physical skills are the physical energy consumption. The 55% ratio of chakra is not easy to be biased, and the technique can also exert greater power.

So what Sun and Moon have to do now is to extract chakra and make chakra show strong physical energy. This is not difficult. Sun and Moon quickly found the trick, which is to feel the feeling of vitality in chakra with their hearts. It is a feeling of vitality, leaping, and growth, and then release it. The negative nature changes are the opposite. You must work hard to feel the mental power in chakra, which is a feeling of spirituality, rejuvenation, and will, and then release it.

This is the same as Naruto practices the changes in the nature of the chakra. You should feel the lightness, flow, sharpness, thinness and other characteristics of the chakra stroke attribute. Then try to make the chakra feel like it, and then use chakra to try to cut leaves to deepen the feeling of change.

The sun and the moon quickly changed the chakra. After all, his chakra has strong vitality. Although the change is not perfect, it cannot reach the extreme of the positivity change. It is just just getting started, but Tsunade was surprised to be able to achieve the change of positivity so quickly.

Sun and Moon tried to change the negative properties again, which was much more difficult than the positive properties. However, under the keen and careful feeling of Sun and Moon, they quickly found the agility, radiance and will feel in the chakra. The change in the negative properties of chakra was also successful, and Tsunade was a little shocked now.

At the same time, the sun and the moon also found that the two attributes of yin and yang are not only one that can be changed at the same time. The two are integrated, hidden and replaced by each other. Chakra can produce yin and yang at the same time, but it is too difficult to have yin and yang changes at the same time. It is impossible for the sun and moon to achieve the current situation.

Sun and Moon guessed that this is the basis of the legendary "Yin and Yang Escape", the combination of Yin and Yang Escape. But Sun and Moon didn't know that he had the reincarnation eye and the immortal body to have the possibility of using Yin and Yang Escape. Most people cannot let chakra change the two properties of Yin and Yang at the same time. This is limited by the blood relay network and belongs to the "power only immortals have".

Tsunade nodded at the chakra with the slightest yang attribute in Sun and Moon's hand: "It seems that you can already change the nature of Yin and Yang. Although you are not yet proficient, it is already very good. In the current situation, Sun and Moon can use healing techniques, but you can only barely achieve this level! To reach a higher level, we need to start the 'Yang attribute change special training'!"

Just like Naruto used cutting leaves to train wind attribute changes, Yang attribute changes also require practice. Tsunade handed the sun and moon a basket of yellow leaves that had turned yellow.

"Master, is this?" Riyue asked at the pile of yellow Ye. He didn't expect that he would use leaves when practicing Yang Dun. Shouldn't he use fish, jealous mouse and other things?

"This is a training equipment. You need to use chakra on the leaves. Then you need to make the whole yellow leaf turn green again!" Tsunade said with a smile.

"Ah? Let the leaves regain their vitality, isn't this Wooden Escape?" Hearing Tsunade's words, the sun and the moon were stunned.

"Where is this wood escape? Wood escape is a combination of chakra from water and soil, as the source of life, controlling plant growth and development, and even using chakra to directly create plants."

"Master, what I teach you is to use yang-attribute chakra to stimulate plant cells, so that the chloroplasts in the cells can recreate a large amount of chlorophyll! The plant has strong vitality and is not easy to die. It also has a cell wall. It is not easy to be damaged by chakra you have not controlled well, but it is not easy to be stimulated by chakra, so it is difficult. This is specially used to train yang-attribute chakra changes!" Tsunade touched Riyue's head and said.

"Oh, I understand. I thought I was going to give the leaves a new life. Then, how can I train the chakra changes of Yin attributes?" Riyue asked curiously.

"In turn, take a green leaf and make the leaf turn yellow." Tsunade said.

"Ah? Make the leaves turn yellow?" Sun and Moon were stunned again, and they were still practicing with leaves. Sun and Moon thought they wanted to use their spiritual energy to make something out of thin air.

"Yes, use the Yin-property chakra to act on the cells on the leaves to cut off the connection between the leaves cells to the outside world and let the cells perform the autumn leaf fall procedure. Most of the chlorophyll in this plant cell will gradually decompose under the action of enzymes and oxygen, and the color of carotenoids and anthocyanins will be displayed, and the leaves turn yellow." Tsunade said.

"Wow, this method of deceiving plant cells is somewhat similar to illusion! However, plant cells have no IQ and are just adapting to bad situations. As long as you artificially use chakra to influence the environment, you can affect it." Riyue said intimidly and nodded.

So the sun and moon set out five shadow clones against a pile of yellow leaves.
Chapter completed!