H11b1 is a subclade of the Haplogroup H of mitochondrial DNA (mtDNA) 1. It is a rare subclade that has been identified in a few individuals. I found some resources that might help you learn more about H11b1: Wikipedia: You can find a brief overview of Haplogroup H and its subclades, including H11b1, on Wikipedia. FamilyTreeDNA: The Haplogroup H&HV mtGenome Project on FamilyTreeDNA provides i...