The<unk> s are soluble (permeable), in contrast to other, membrane-bound substances of the hematopoietic microenvironment. This is sometimes used as the definition of<unk> s. They transduce by paracrine, endocrine, or autocrine signaling.
Colony-stimulating factor
Leukemia inhibitory factor
Macrophage colony-stimulating factor
Granulocyte colony-stimulating factor
Granulocyte-macrophage colony-stimulating factor
Erythropoietin
Hemopoietic growth factor
Interleukin