An ongoing series of cover illustrations for The Lancet Haematology throughout 2024 Stem Cell Transplantation Rare Immune Diseases Developing Guidelines for the Diagnosis and Management of Pyruvate Kinase Deficiency Haemoglobin Thresholds Treating Vaso-Occlusive Events in Patients with Sickle Cell Disease Hydroxyurea for Children with Sickle Cell Disease in Sub-Saharan Africa Local Radiotherapy Treating Primary Immune Thrombocytopenia Hope for Patients with Richter Transformation 10 Year Anniversary Edition Pregnancy-Associated Blood Cancer Outcomes.