There are multiple definitions:

1. Consiglio dei Politecnici Federali(Italian)

   • Organizations (scientific)

2. CRY photolyase family(English)

   • these proteins possess a relatively conserved photolyase homology region (PHR) domain and a vastly varying carboxyl-terminal extension (CTE), which can comprise tens to hundreds of amino acids
   • CRY, CTE, DSPD, PHR
   • Proteins / proteomics
   • https://doi.org…003-022-04054-9