sentences:  It reaches frequencies of up to 100 percent in some parts of the Maghreb, and is dominated by its sub-clade E-M183.M81 is thought to have originated in North Africa up to 14000 years ago, but a single 2200-year-old branch M183-PF2546 dominates Northern and Eastern Berbers.Its parent haplogroup E1b1b is associated with Afro-Asiatic-speaking populations, and is thought to have arisen in the Horn of Africa.