TRIM21 and familial pancreatic carcinoma: To investigate the role of TRIM21 in pancreatic cancer cells, we established TRIM21‐overexpressing (TRIM21‐OE) cell line models for BXPC3, SW1990, and Pan02, as well as TRIM21‐knockout (TRIM21‐KO) cell line models for SW1990 and PANC1 (Figure S2A,B, Supporting Information).