[1] The Genome Taxonomy Database considers it a strain of Paenarthrobacter ureafaciens following a 2016 reclassification.

A few newer strains have been created by growing the original KI72 in different conditions, forcing it to adapt.

Instead of being a completely novel enzyme, it appears to be a member of the N-terminal nucleophile (N-tn) hydrolase family.

More importantly, one of the enzymes involved was produced by a frame-shift mutation that completely scrambled existing genetic code data.

This is seen as a good example of how mutations easily can provide the raw material for evolution by natural selection.

[19][20][21][22] A 1995 paper showed that scientists have also been able to induce another species of bacterium, Pseudomonas aeruginosa, to evolve the capability to break down the same nylon byproducts in a laboratory by forcing them to live in an environment with no other source of nutrients.

[23] Integration of EI and EII into the genome of the bacterium Pseudomonas putida KT2440 enabled the development of a strain that can metabolize Nylon oligomers.

[24] Metabolism of common Nylon monomers like aminocaproic acid and hexamethylenediamine was realised by the deregulation of polyamine metabolism, guided by Adaptive laboratory evolution experiments with nylon components as sole source of nutrients.