We wrote almost exactly the same thing :) One nitpick it is not male hybrids that had reduced fertility, but following Haldane’s rule it was the male SSA (sub-

We wrote almost exactly the same thing :) One nitpick it is not male hybrids that had reduced fertility, but following Haldane’s rule it was the male SSA (sub-saharan african) and Denisovan/Neanderthal female offspring that were infertile - the other way around were fertile or else there would be no descendants of the Denisovans and Neanderthals living today.