| Research on mitochondrial DNA suggests that Hag and her descendants are misplaced in the Massey Mare's female family, and derive from another, as yet unidentified, mare in the 2nd Earl of Portmore's stud (E.W. Hill, et.al., "History and Integrity of Thoroughbred Dam Lines Revealed in Equine mtDNA Variation," Animal Genetics 33, 187-294. London: Blackwell Publishing).
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