An article in the January 2012 issue of the "American Journal of Physical Anthropology" also tends to argue against the Solutrean theory on genetic grounds, as did researchers in Italy, who argued that the distinctively Asian C4c and the disputed X2a had "parallel genetic histories". The abstract of that article also states that "he similarities in ages and geographical distributions for C4c and the previously analyzed X2a lineage provide support to the scenario of a dual origin for Paleo-Indians. Taking into account that C4c is deeply rooted in the Asian portion of the mtDNA phylogeny and is indubitably of Asian origin, the finding that C4c and X2a are characterized by parallel genetic histories definitively dismisses the controversial hypothesis of an Atlantic glacial entry route into North America."