Signalling

Cell-cell communication via extracellular signalling requires 6 steps

  1. Synthesis of signalling molecule by signalling cell
  2. Release of signalling molecule by signalling cell
  3. Transport of signalling molecule to target cell
  4. Detection of signal by specific receptor protein
  5. A change in cellular metabolism, function or development
  6. Removal of the signal, terminating the response

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