S23-417 Lusutrombopag is used for stable and reproducible human ex vivo hematopoietic stem/progenitor cells expansion Hematopoietic stem and progenitor cells, collectively "HSPCs", are multipotent cells that can self-renew and differentiate into all types of blood cells, including cells of both myeloid and lymphoid lineage. Masashi Miyauchi Hiromitsu Nakauchi