Our efforts to characterize exactly how the mutagens work have met with no success.
The working theory is that XE037 is somehow able to imprint with the phenotypic end product of an entire gene sequence, and reimpose that effect on a target, starting at a microcellular level and rapidly spreading to tissue, organ, and organ systems.
Still, there is little to no evidence of tampering at the genetic level.
We can't determine what is enforcing the changes, but it must be supplanting the genetic machinery directly.