GFI1B (Growth Factor Independence 1B): GFI1B is a transcriptional repressor that plays a key role in the development and differentiation of red blood cells and platelets. It regulates genes involved in the cell cycle and apoptosis, helping maintain a balance between cell growth and maturation. Dysregulation of GFI1B is associated with blood disorders such as anemia and thrombocytopenia, and it also contributes to leukemia development. Its function is essential for maintaining hematopoietic cell balance and highlights the complexity of blood cell production.