"In search of another candidate, Narasimhan et al. (2019) sought out samples from the Oxus (or ‘BMAC’) civilisation, but again effectively drew a blank: no significant Steppe ancestry, but largely Iranian continuity instead. What the main BMAC culture site at Gonur Depe does host, however, already by 4250 BP, is a burial of a horse and wagon with bronze wheel rims, and perhaps even soma (or haoma) preparation — supposedly good markers of early Indo-Iranic, for example, but genetically not from the Steppe. Indeed while their ultimate origins would lie in the Caucasus/Zagros homeland, there is no strong case for excluding that the long evolution into the distinctly Iranic branch proceeded in or near what is now Iran, and the distinctly Indic branch on the Indus, spreading then also along the Ganges."