A flaw in the Rat species’ coding and anti-mutt protocol threatens to muddle all the various breeds of rat into a homogeneous single species. The rats embrace this. With Genotype’s assistance, over several decades they selectively refine their breed into the current RAT image, black fur, red eyes, steely grey accents.
Genotype becomes associated with, and soon dominated by, the Rat species.
Date: 63 AE. Best guess: part of the cluster of major, defining projects Genotype, ASR, and Pulse started on around 70 AE. Long before the Mouse received created.