MT-RNR1 and Hodgkins lymphoma: The second region with high prevalence of the mitochondrial form of HL caused by the m.1555A > G variant of the MT-RNR1 gene, was found by us in the Baikal Lake region of Russia, where the proportion of the m.1555A > G variant among Buryat patients (20.2%) was comparable with Spanish patients (36.3%) (Fig. 3).