Abstract: The invention relates to transformed blood cells and their use for active ingredient screening. The field of application of the invention are the pharmaceutical industry and medicine.

Abstract: The present invention provides novel panels of molecular targets that regulate erythropoiesis. The novel panels of the invention may be used, for example, in therapeutic intervention, therapeutic agent screening, and in diagnostic methods for diseases and/or disorders of erythropoiesis.

Abstract: The invention provides methods and compositions relating to a dendritic cell expression database.

Abstract: The present invention concerns methods for producing differentiated cells from immature hematopoietic cells. Preferably, a gene coding for a conditional v-rel estrogen receptor fusion protein, v-relER, that causes estrogen-dependent but otherwise unaltered v-rel-specific transformation, is introduced into bone marrow cells. Following inactivation of v-relER oncoprotein activity by administration of an estrogen antagonist, cells differentiate into antigen-presenting dendritic cells as judged by several morphological and functional criteria. Additionally, under different culture conditions, v-relER cells differentiate into cells resembling polymorphonuclear neutrophils. The invention further concerns differentiated cells obtained by the claimed method as well as their use for screening of potentially immunomodulatory substances and in the development of vaccines.