EBIProteins Get Domains Sites

Get domain and site features for a protein from the EBI Proteins API. Returns binding sites, DNA-binding regions, active sites, motifs, regions of interest, and zinc finger domains annotated in UniProtKB. Complements InterPro domain annotations by providing more granular functional site information. Example: P04637 (TP53) returns 31 features including DNA-binding domain (residues 102-292), interaction regions with MDM2/CCAR2/HRMT1L2, zinc binding sites, and p53 transactivation motifs.