A bottleneck of two, or a first pair at our origin older than 500,000 years, is possible.
In effect, protein engineers are using the power of random change plus intelligent design to see what if anything will improve function.
How interesting and how odd, I thought. I am in Seattle. But what’s a think tank that promotes intelligent design doing in Seattle?
I don’t think the study can claim all the things it does based on the evidence they have.
About the movement of organelles: There are molecular motor proteins that haul them around!