ZFP36L1 and infection: We optimized adeno-Cre multiplicity of infection (MOI) based on loss of Zfp36, Zfp36l1, and Zfp36l2 mRNA expression (Figures S3B and S3C) and confirmed loss of ZFP36 and ZFP36L1 protein expression in the adeno-Cre-infected, FBS-stimulated Zfp36/l1/l2 triple-floxed MEFs (Figure S3D).