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Jak-Stat Signaling definitions

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  • JAK2
    A cytosolic tyrosine kinase recruited by dimerized cytokine receptors, essential for phosphorylation events in the pathway.
  • STAT5
    A transcription factor with an SH2 domain, recruited to phosphorylated receptors and activated for gene regulation.
  • Erythropoietin
    A 165-amino acid cytokine released by kidneys, acting as a ligand to stimulate red blood cell formation via signaling.
  • Cytokine
    Small, soluble proteins that regulate development, differentiation, and hematopoiesis through cell signaling.
  • Cytokine Receptor
    A membrane protein that binds ligands like EPO, undergoes dimerization, and recruits kinases for signal transduction.
  • Dimerization
    The process where two receptor monomers join upon ligand binding, enabling downstream signaling events.
  • Phosphorylation
    Addition of phosphate groups to tyrosine residues by kinases, creating binding sites for signaling proteins.
  • SH2 Domain
    A protein region that specifically recognizes and binds phosphorylated tyrosine residues on receptors.
  • Transcription Factor
    A protein that enters the nucleus to regulate gene expression, often activated by signaling pathways.
  • Hematopoiesis
    The process of forming erythrocytes, promoted by signaling events in bone marrow following pathway activation.
  • Tyrosine Kinase
    An enzyme that catalyzes phosphorylation of tyrosine residues, crucial for signal propagation in cells.
  • Nucleus
    Cellular compartment where dimerized transcription factors regulate gene expression after signaling.
  • Monomer
    A single receptor unit that, upon ligand binding, pairs with another to initiate signaling.
  • Autophosphorylation
    A phosphorylation process resembling self-activation, but here performed by recruited kinases on receptors.
  • Gene Regulation
    Control of gene expression by transcription factors, leading to cellular responses such as red blood cell production.