LGALS1 and alkaline phosphatase measurement: Interrogating a scRNAseq dataset capturing both HSPCs and total MNCs from healthy donors (13,713 cells) and patients with AP/BP-MPN (44,107 cells) revealed significantly increased LGALS1 expression in HSCs, multipotent progenitors and megakaryocyte-erythroid progenitors but not granulocyte-monocyte progenitors or mature blood cell lineages (Suppl.