[New knowledge of the structure and action of animal cell growth and hematopoiesis-regulating factors].

A survey is given of several new growth factors from tissues of animals, in particular of the endothelia cell growth factor (= heparin-binding growth factors), the multipotent growth factors from brain of cattle, the prostatropins as well as the growth factors for fibroblasts and glia-cells. Several more recent recognitions on the importance of the insulinlike growth factors, the tumour growth factors and the chalones are described. For the regulation of the haemotopoiesis the factor furthering the formation of multicolonies (= pluripoetin, interleukin 3), the factor furthering the formation of erythrocyte-macrophages colonies, the factor furthering the formation of macrophage-colonies and the erythropoietin are of importance.