Matrias Tribe

The Matrias Tribe is a small tribe in the world of One Piece, they are a tight group of humans that have grown very capable by use of a strange mutation on the women of the tribe.

History
TBA

Female Members
Most if not all members of the tribe are descendant from a woman long ago that was born with a odd mutation, the women of this clan share with her the ability to produce a unique enzyme in their mammary glands, the enzyme Infragilin.

Infragilin is a enzyme unique in it's design and creation created by chance that defies biological expectations, when consumed and allowed to roam the blood stream it'll proceed to bond to muscles and bones and reinforce them. This effect is particularly noticeable in bones, once Infragilin has reached bone cells it'll proceed to alter the bones making them nearly indestructible.

The process which governs this result is not fully understood by science but it's thought to be allowed by bone marrow and the logic behind it is similar to that of the difference in hardness between diamond and graphite despite being made of the same substance.

While less noticeable on the muscle mass and skin Infragilin can also bond to these and make them tougher and more resistant to environmental stress that may cause wear and tear to them.

Male Members
Unlike the female members of the tribe the males are unable to produce Infragilin, however by being breast fed since childhood they too display superhuman levels of endurance and toughness.