Schematic display of neurobiologic genes expressed in primary human CD34⁺ hematopoietic stem and progenitor cells. All genes, the expression of which we newly demonstrated in human CD34⁺ cells, are colored. Intracellular rooms (ICR) and extracellular rooms (ECR) are indicated. (A) Motility and cytoskeletal genes. (B) Receptors and ion channels.