Proto-Slavic, the supposed ancestor language of all Slavic languages, is a descendant of common Proto-Indo-European, via a <answer>Balto-Slavic</answer> stage in which it developed numerous lexical and morphophonological isoglosses with the Baltic languages. In the framework of the Kurgan hypothesis, "the Indo-Europeans who remained after the migrations [from the steppe] became speakers of <answer>Balto-Slavic</answer>".
The Indo-Europeans who remained after the migrations became speakers of what?
Balto-Slavic