PARR showed polyclonality for TCRγ in 2 cats and bi- or oligoclonality (with a polyclonal background) in 3 cats with CIE, whereas mono-, bi-, or oligoclonality was detected in all 5 cats diagnosed with IL (and a polyclonal background in 2 of those cats). This evidence concerns the gene TRGC1 and congenital non-bullous ichthyosiform erythroderma.