GFI1B (Growth Factor Independence 1B): GFI1B is a transcriptional repressor that plays a crucial role in the development and differentiation of red blood cells and platelets. It regulates genes involved in the cell cycle and apoptosis, helping to maintain a balance between cell growth and maturation. Dysregulation of GFI1B is linked to blood disorders such as anaemia and thrombocytopenia, and it also contributes to the development of leukaemia. Its function is vital for maintaining haematopoietic cell balance and underscores the complexity of blood cell production.