Newts and lizards are widely known for their ability to regenerate damaged limbs. Newts are able to restore the lens of the eye, limbs and tail, part of the lower jaw with new teeth. Lizards are just a tail. In mammals, the most significant vivid example of complete organ regeneration is the annual change of horns in the ungulates of the deer family. Another interesting fact is the ability of bats to repair holes in the skin of wings, in rabbits and domestic cats - holes in the shell of the ears, the ability to grow fingertips in mice.
The fact that the human body also has a natural ability to regenerate is evidenced by numerous statistics. Believe it or not, a severed human finger can grow back.
In the early 70s in England, as a result of a medical error, one teenager with an amputated finger phalanx did not undergo the usual procedure for suturing a wound with a skin flap in such cases, which leads to the formation of a stump, or attempts to sew an amputated phalanx microsurgically, which leads to deformities due to scars and decreased tactile sensitivity. When surgeon Cynthia Illingworth (C.M.) discovered the omission, she also found, to her deepest surprise, that the fingertip was regenerating. Then she stopped interfering with the natural course of things in similar cases and by 1974 had documented several hundred regenerating fingertips in children under 11 years of age.
Clinical studies by other doctors have confirmed that if the first phalanx of the fingertips is lost to a certain level (Fig. 2), the missing part will invariably recover within three months. At the same time, the border between complete recovery or lack thereof is very clear and without an intermediate zone. Therefore, today, with a partial loss of the first phalanx of the fingers, surgeons amputate the remaining part, since the newly grown fingertip will be much better than the sewn one due to the inevitable scars. The wound must remain open and the fingertip will grow back with a superior nail and fingerprints.
Initially, it was believed that only children are able to restore fingertips in this way, but R.B. Borgens R.B. in his publication clearly states that this phenomenon is observed in both children and adults.