What makes men’s face more male than womens?
A study published in the Proceedings of the National Academy of Sciences (PNAS) this month has a simple answer.
The answer comes from a genetic marker that has been found in a range of facial hair types, including men and women, says lead author Andrea Bussaro of the University of Illinois.
Bussari and her colleagues have previously found a marker for the same genetic marker in facial hair of both men and men.
But they found that in women, the marker was present only in some facial hair.
The new study adds support to a growing body of research showing that some facial features are more male in men than in women.
“This marker, called the FTM-A1, is known to be involved in the development of the male face, but not in women,” Bussario says.
The marker is present in women only in the hair on the nose, cheeks and chin.
Previous studies have found that the FTL-A gene (FTL) is expressed on the X chromosome, which is found in males.
FTL is thought to be the reason that the facial features of males and females differ in humans.
It also plays a role in the shape of the brain, says Jennifer Stoeckle, an associate professor of biobehavioral and evolutionary biology at the University at Buffalo in New York.
The FTL gene is involved in hair production and differentiation.
But in men, the gene is found only in certain types of facial skin and in a subset of hair.
Stoece has also been studying the FTT-A2 gene (TF-A), which is also found on the Y chromosome and in men.
She and Bussaro found that FTL and FTT were not found in the FST and the FTF hair types.
The presence of these two genes, however, did not make the men’s hair more male.
Busesaro says that this may be because of differences in the expression of the two genes.
It may be that, because the FTR-A3 gene is expressed only in a small number of hair types (like the FTS-A5), FTT and FTL are expressed more frequently in women than in men who have the Ftr-A-3 gene.
“It’s not that the men have more FTR,” says Stoechle.
Instead, she thinks that the two hair types might have different patterns of expression.
The researchers also found a variant of the FNT-A marker, the FHT-A6, which does not show up in the skin of men but in the facial hair in women of the same type.
The findings suggest that FTR is a complex gene, and the changes in its expression may be due to a variety of factors, Bussero says.