New Genetics Research

[Xaviens]

and I've at least once sat there for an absurd length of time repeatedly scrambling a monkey in order to try and find High Complexity DNA, with no avail.

High-Complexity DNA is exclusively in humans (I can't remember whether that includes NPC humans, and can't be bothered to look it up), but you'll never get it by scrambling monkey DNA. There's some flag on the various genes that sets this, and I'm pretty sure it was just High Complexity DNA that has that flag.

Of course, this is going off of the release code, so things may have changed.

That's correct. High Complexity is a humans-only thing, though you can easily mass produce injectors of it and harvest it from monkeys after you've found it once, makes the combo genes vastly easier to produce.