CDKN1A and viral infectious disease: Contaminating proteins, such as proteins originating from the skin, serum, cellular response to a viral infection, as well as proteins identified in less than four out of nine samples total for three groups (MBP, MBPCit, and p21), were excluded from the obtained arrays (Sheet Nonspecific of Supplementary Tables S2 and S3 for TurboID and FLAG-IP methods, respectively).