SUMMARYTransferrin D1 and "ancestry labels" (TikTok @miz_nelly, sent by Tito Nov 7, 2026; screenshots in receipts/2026-11-07_transferrin-tiktok). TWO RECEIPTS, checked. (1) THE 1967 PAPER, Record: Wang, Sutton and Scott, "Transferrin D1: Identity in Australian Aborigines and American Negroes," Science 156:936 (May 19, 1967). They compared the D1 blood protein from ONE Australian Aboriginal donor with ONE Black American sample and found the same glycine-for-aspartic-acid substitution in peptide 1C. That finding is real. (2) WHAT THE VIDEO ADDS THAT THE PAPER DOESN'T SAY, checked against the paper's own text on screen: the AI summary says D1 was "completely absent from the continental African baseline samples" and that the match "proves a direct, shared ancestral connection." The paper itself lists Tf D1 "in Africans, American Negroes, Australian aborigines, Melanesians, and Micronesians," speaks of "the same primary allele in both Africans and Australoids," and weighs two explanations (independent mutations, or one mutation before the populations separated) without settling it. Kirk's 1968 world survey: D1 is "widespread in Africa, with frequencies of the order of 10% in most localities" (about 1–15%, none in Ethiopia); "common in all populations of Australian Aborigines" (5–53%); New Guinea 10–30%; "about 10% of American Negroes," and 26% in the Sapelo Island isolate. Native Americans mostly carry a different variant, DChi, with D1 largely absent. So the "absent in Africa" step is contradicted by the paper and by Kirk (a named test: the frequency surveys). What stands: a real shared protein variant across Africa, Australia, Melanesia and Black America, i.e. the deep southern-route ("Australasian / Population Y") question the video points to (P805–P806), which stays Open. Open lead: why Sapelo Island's Geechee isolate runs 26%, higher than most of Africa. (3) THE ARXIV PAGE, Record and strong: Coop, "Genetic similarity versus genetic ancestry groups as sample descriptors in human genetics" (arXiv 2207.11595, 2022): "all these statements about ancestry groups are really statements about the genetic similarity to other samples whose population descriptors we choose to propagate as our 'ancestry group' labels." Testing companies' "% African / % European" means similar to chosen reference panels (YRI, Yoruba in Ibadan; CEU, Utah Europeans). This is Rule 14 from a leading geneticist's own pen: the control samples are a choice (who sets the control).