Some modern people from Sub-Saharan Africa were found to carry a five tandem repeat variation of the MUC7 gene that is highly divergent from other, modern humans. The estimated coalescence age for the human variations of the MUC7 gene is estimated to be around 4.5 million years ago, which predates the human-Neanderthal split. Neanderthals and Denisovans also carry variants that are much closer to those of other, modern humans; thus, researcers postulate that this divergent Sub-Saharan variant most likely introgressed from a currently yet-unknown archaic human ghost population.[4]
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