Analysis of Y-chromosome have found three Y-chromosome lineages (E1b1b-M81, J-M267 and E1b1b-M78) at high frequency in Libya like in other North African populations. Some studies suggest a Paleolithic component for E-M81 and E-M78, while other studies point to a Neolithic origin. E1b1b-M78 has probably emerged in the Egypt/Libya area and is today widely distributed in North Africa, East Africa, and West Asia. E1b1b-M81 show high frequencies in Northwestern Africa and a high prevalence among Berbers (it is sometimes referred to as a genetic Berber marker). Its frequency declines towards Egypt and the Levant. On the other hand, E-M78 and E-M123 are frequent in the Levant and Egypt and decline towards Northwest Africa. Another common paternal lineage in Libya and North Africa is haplogroup J through its subtypes J1 (M267) and J2 (M172). J1 is prevalent in some North African and all Levantine groups and found at high frequencies in the Arabian Peninsula. It has been previously associated with the Islamic expansion. J2 is sporadically detected in North Africa and Iberia and is very frequent in the Levant/Anatolia/Iran region. Its spread in the Mediterranean is believed to have been facilitated by the maritime trading culture of the Phoenicians (1550 BC- 300 BC). E-M2 is the predominant lineage in Western Africa.