Have you ever wondered what you have your hair on your feet, but not on the feet of your feet?
Or what do we get a lot of hair on the head, but not a single hair on the palms of our hands?
The question is, for years, a pending issue for doctors, researchers and other scholars of the complex body of the human body.
For decades, science is limited to considering it is a Evolutionary trait Of some animals, but the physiological explanation of how it has been formed until recently a question.
Scientists at the University of Pennsylvania School of Medicine investigated this "mystery" for years and now claim to come up with a response.
The study, published in the journal magazine Cell Reports, Indicates that "the culprit" of No We get hair in certain areas of our body is a special type of molecular, for more signal, a protein.
According to the researchers, it is about Dykkopf 2 (DKK2), which blocks the so-called "WNT signaling pathways", cellular channels that, among other things, are responsible for triggering hair growth.
"In this study, we show that skin in hairless regions naturally produce an inhibitor that prevents WNT from doing their job," he told the journal. Newsweek Sarah E. Millar, one of the authors of the investigation.
"We know that WNT signaling is essential for the development of hair follicles, blocking it causes a hairless skin and activating it causes the formation of more hair," he said.
But what do some animals have the most of their bodies and others do not do?
Things of Evolution
The study provides that it is, as it was known for years, of an evolutionary adaptation.
The research mentions that certain animals evolved to produce DCC 2 in some parts of their bodies Help them to better survive their environments.
Thus, for example, a hairless hand would serve more to stop the instruments or other tasks, while the absence of wily on the soles of the foot would help to get better.
In cold climates, however, it would be better if they were coated, as in the case of polar bears.
To achieve the conclusions, the team distributes the skin of the feet of a mouse (which, as humans, does not have hairs on their plants) and compared with other animals that do, such as rabbits.
When comparing the levels of DCC 2 between the two species, they found that the amount of protein is considerably less in the skin of the animals that have hair on the socks of their legs.
Meanwhile, the level of the molecule is much higher in areas where the hair does not grow as in the purest areas.
The study indicates that there is not any in the areas there are no signaling pathways, hair generators, but the protein blocks them.
Researchers hope this can be used for new hair growth research, to treat some diseases or future treatments to people who have suffered heavy burning or accidents.