According to Sumerian legend, the Anunnaki genetically manipulated our genetics and created three versions of what we know as mankind, today.
The Anunnaki may have reptilian blood too, as they intermixed with their creations.
We don’t specifically know how our DNA was manipulated. What we DO know is that only 20 of the 64 codons in our DNA are active.
Additionally, our human DNA differs dramatically from all other primates as we only have 46 chromosomes compared to 48 in other primates. The first two chromosomes appear to be fused together, which may explain part of the genetic manipulation by the Anunnaki.