Yup they splice and rejoin their DNA in specific sites as part of V(D)J recombination (this isn't the somatic hypermutation the article mainly focuses on, which

Yup they splice and rejoin their DNA in specific sites as part of V(D)J recombination (this isn't the somatic hypermutation the article mainly focuses on, which is a B cell specific process). 'Our' gene editing tools (CRISPR) were not designed by us, but come from nature, so maybe not surprising!