X chromosome

It may have some genetic material missing, damaged or swapped with the X chromosome, depending on the variation.

The team identified over 140 new genetic risk loci, increasing the number known eight-fold to 164, including three on the X chromosome.

The team found that, compared to the X chromosome, the Y chromosome varies greatly across ape species and harbors many species-specific sequences.

They examined the X chromosome, which earlier studies did not do, and found five loci linked with PTSD.

Unlike women, who have two X chromosomes, men have an X and a Y. For a long time, the genes found on the Y chromosome were not thought to play important roles in disease.