- Ultrafiltered pig leukocyte extract (UPLE, IMUNOR) potentiates hematopoiesis-stimulating effects of G-CSF in vitro and improves the outcome of treatment of hematopoietic radiation damage in mice with G-CSF. Vacek, A., Hofer, M., Schneiderová, H., Svoboda, J. Immunopharmacology and immunotoxicology. (2005)