The polycomb-group (PcG) proteins function as general regulators of stem cells. We previously reported that retrovirus-mediated overexpression of Bmi1. a gene encoding a core component of polycomb repressive complex (PRC) 1. maintained self-renewing hematopoietic stem cells (HSCs) during long-term culture. https://allfixelectricales.shop/product-category/defrost-elerefrment/