R-BY39921 is a branch on the paternal tree of human kind. It and branches help trace human history from our origin in Africa.
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R-BY39921 Technical Details
This branch is defined by the Y-Haplotree at FamilyTreeDNA as R-BY39921. There, it is the child of the R-BY39919 branch.
I am working on linking information from the public YFull tree. This branch is not linked yet.
Sources & Resources
Peer reviewed sources have not been added for this branch yet. If you know of one I have missed, please link to it in the comments.