I mean mostly those that are yet to be sampled or identified. For instance I'd like to know how different or how similar autosomally various Early Slavic tribes were. Did various Slavic tribes that later formed 'Poles' have distinctive features to them (Lendians, Polans, Vistulans, Goplans, Bobrzans etc.)? Were Slavs who could still easily communicate with each other inhabiting vastly different areas comparable to each other by their genetic profile?