CD33 is differentially expressed in RM but not human HSPCs. (A) mRNA expression from bulk sequencing of HSCs and EMPs from 3 human donors (left) and 3 macaque donors (right) normalized to glyceraldehyde-3-phosphate dehydrogenase (GAPDH) transcripts. (B) Representative flow plot of the canonical HSC marker CD90 against CD33 in human (top) and rhesus (bottom). (C) Calculated antigen per cell on HSCs, EMPs, and LMPs in human (left) and rhesus (right). mRNA, messenger RNA.