THPO and idiopathic aplastic anemia: Indeed, THPO mimetic drugs, such as romiplostim and eltrombopag, have been shown to improve recovery after ablative challenge, and have also been used clinically to support hematopoiesis in diseases such as immune thrombocytopenic purpura and aplastic anemia (Desmond et al., 2014; Gill et al., 2017; Rodeghiero and Ruggeri, 2015; Yamaguchi et al., 2018).