<Tr> <Th_colspan="4"> show Gene ontology </Th> </Tr> <Tr> <Th> Molecular function </Th> <Td> hormone activity protein kinase activator activity protein binding erythropoietin receptor binding cytokine activity </Td> </Tr> <Tr> <Th> Cellular component </Th> <Td> extracellular region cell surface cell body extracellular space </Td> </Tr> <Tr> <Th> Biological process </Th> <Td> erythrocyte maturation negative regulation of cation channel activity response to interleukin - 1 response to hypoxia negative regulation of intrinsic apoptotic signaling pathway in response to osmotic stress response to nutrient response to salt stress negative regulation of erythrocyte apoptotic process response to testosterone regulation of transcription from RNA polymerase II promoter response to hyperoxia positive regulation of Ras protein signal transduction aging negative regulation of apoptotic process negative regulation of transcription from RNA polymerase II promoter response to electrical stimulus blood circulation response to estrogen cellular hyperosmotic response positive regulation of transcription, DNA - templated response to vitamin A response to lipopolysaccharide acute - phase response peptidyl - serine phosphorylation response to axon injury hemoglobin biosynthetic process positive regulation of neuron differentiation positive regulation of cell proliferation regulation of transcription from RNA polymerase II promoter in response to hypoxia positive regulation of ERK1 and ERK2 cascade positive regulation of neuron projection development negative regulation of calcium ion transport into cytosol negative regulation of myeloid cell apoptotic process activation of protein kinase activity embryo implantation signal transduction positive regulation of activated T cell proliferation positive regulation of protein kinase activity negative regulation of neuron death apoptotic process response to dexamethasone cell proliferation erythrocyte differentiation erythropoietin - mediated signaling pathway positive regulation of tyrosine phosphorylation of STAT protein regulation of receptor activity </Td> </Tr>

The hormone erythropoietin is released by the kidney