<qa>  What is the name of the study that the investigators intend to collect?In order to pinpoint specific RUNX1 target genes involved in pre-leukemic transformation or exacerbation of existing leukemia, the investigators plan to compare expression profiles from human hematopoietic progenitors overexpressing a mutated form of RUNX1with controls RUNX1 wild-type and knocked-down. In this study the investigators intend to collect blood, after receiving informed consent, from umbilical cords of neonates born vaginally, in order to isolate CD34 hematopoietic progenitors. Human umbilical cord blood contains relatively high numbers of CD34 cells, which may be frozen directly after collection and used as a source of progenitor cells for further culture or direct analysis. 