Peoples of the Scythian cultures were also found to have a presence of east Eurasian mitochondrial lineages, which are completely absent among the Srubnaya. Groups of the Scythian cultures in the west showed close genetic affinities with the Afanasievo culture and the Andronovo culture, while groups in the east, such as those of the Aldy-Bel culture and Pazyryk culture, showed closer genetic affinities with the Yamnaya culture. Genetic data found negligible evidence of any mobility among populations in the Far East, suggesting the eastern Pontic–Caspian steppe and the southern Urals as the main source of origin of the western Iron Age nomads. Rather than being directly descended from the Srubnaya, the Scythian cultures probably had a shared origin in the Yamnaya culture. The study corroborated the contention that the peoples of the Scythian cultures did not consist of a single homogeneous group, but rather a number of diverse peoples with an earlier common origin. In 2018, a study of mtDNA from remains of the Tagar culture, which is considered a Scythian culture, was published in PLOS One. Remains from the early years of the Tagar culture were found to be closely related to those of contemporary Scythians on the Pontic steppe. The authors of the study suggested that the source of this genetic similarity was an eastwards migration of West Eurasians during the Bronze Age, which probably played a role in the formation of the Tagar culture. In 2019, a genetic study of remains from the Aldy-Bel culture, which is considered a Scythian culture, was published in Human Genetics. The majority of the samples (9 out of 17) were found to be carriers of haplogroup R1a, including two carriers of haplogroup R1a1a1b2-Z93. East Asian admixture was also detected, as 6 haplogroup Q-L54 (including 5 in Sagly culture) and 1 haplogroup N-M231 were excavated. The haplogroup of the remaining 1 sample is said to be uncertain in the paper Probably R). (The significant genetic differences found between Scythian groups of the Pontic Steppe and South Siberia suggest that these were of completely different paternal origins, with almost no paternal gene flowe between them. In 2019, a genetic study of various peoples belonging to the Scythian cultures, such as Cimmerians, Scythians, Sarmatians and Saka, was published in Current Biology.