MARK2 and acute myeloid leukemia: Cyclin-dependent kinases (CDKs) are serine/threonine protein kinases that can be categorized into cell-cycle-related and transcriptional subfamilies based on their primary function.16 Except for the action in transcription elongation, CDK9 also regulates the cell cycle,6 modify chromatin and mRNA,7 repair DNA,17 and promote preadipocyte differentiation.8 Our analysis revealed no significant difference in CDK9 expression between AML cells and healthy tissues.