IRF1 and acute myeloid leukemia: In the HL‐60 acute myeloid leukemia (AML) model that represents a rare RA‐responsive subtype of AML, IRF‐1 is not expressed until RA induces its prominent expression, and ectopic IRF‐1 expression enhances RA‐induced differentiation, motivating interest in how IRF‐1 is putatively needed for RA response.