R-L21 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-L21 Technical Details
This branch is defined by the Y-Haplotree at FamilyTreeDNA as R-L21. There, it is the child of the R-Z290 branch.
This branch is defined by YFull as R-L21. There, it is the child of the R-L2 branch.
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.