Ancestral diversity is limited in published T cell receptor sequencing studies.

Competing Interests: Declaration of interests V.G. declares advisory board positions in aiNET GmbH and Enpicom B.V. V.G. is a consultant for Roche/Genentech. S.M.G. declares honoraria from Mylan GmbH, Almirall S.A., and Celgene and research grants from Biogen outside the submitted work. He receives research funding from the Deutsche Forschungsgemeinschaft, Bundesministerium für Bildung und Forschung, Bundesministerium für Gesundheit, the National MS Society, and the European Commission.