Lineage Factor

The Lineage Factor is the blueprint of life itself, present in all living organisms. It was discovered by a research team led by Dr. Vegapunk and Vinsmoke Judge.

Overview
All lifeforms have the Lineage Factor, and by manipulating it from a young age, the growth of a lifeform can be changed. Eating a Devil Fruit affects one's Lineage Factor, which allows them to gain a supernatural power.

SAD
By applying Lineage Factor, Caesar Clown was able to create SAD, a key ingredient used in the development of artificial Devil Fruits known as SMILES, as explained by Trafalgar Law. However, they are restricted to the Zoan-class.

Modified Humans
While his wife was pregnant, Judge forced her to undergo the surgery which manipulated the Lineage Factor of the four fetuses she was carrying. However, due to Sora's interference, only three of their four sons were born as modified humans. After their birth, they were further experimented on, including being administered drugs, in order to increase their development. These experiments were also performed on their elder sister.

The successfully modified sons (Ichiji, Niji and Yonji) developed an Exoskeleton (外骨格), gained an increased healing ability, and, with training, rapidly increased in strength and resilience; soon, these qualities developed to a point equaling those of adult soldiers, while the children were in their early childhood. Supposedly, the modifications also took away their ability to feel emotions. However, Ichiji, Niji, and Yonji are able to be attracted to pretty women, laugh at jokes, and ridicule Sanji.

While Reiju received the same physical enhancements, she retained her emotions, but lost the ability to refuse Judge's orders.

Cloning
Vinsmoke Judge conducted several researches and experiments with the Lineage Factor, becoming able to artificially manufacture human beings to fill the soldier ranks of Germa 66. Those soldiers are known as Clone Soldiers (兵) and they are made without the knowledge of their origin.

Trivia

 * The Lineage Factor is a reference to DNA, the molecule that contains all the genetic information of the host organism.
 * Despite eating a Devil Fruit changes one's Lineage Factor, the effects are not passed down through hereditary, as Charlotte Linlin, who gained the Soru Soru no Mi powers since six years old, had 85 children, none of whom gained the same power in anyway, and were even able to eat their own Devil Fruits as well.

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