Extracellular signaling

Communication by extracellular signals usually involves six steps: (1) synthesis and (2) release of the signaling molecule by the signaling cell; (3) transport of the signal to the target cell; (4) detection of the signal by a specific receptor protein; (5) a change in cellular metabolism, function, or development triggered by the receptor-signal complex; and (6) removal of the signal, which often terminates the cellular response.   Subscribe in a reader

Protein Recycling

Recycling is important not only on a global scale, but also at the cellular level, since key molecules tend to be available in limited numbers. This means a cell needs to have efficient recycling mechanisms.Certain intercellular proteins are needed to respond to specific extracellular signals. This movie covers how such proteins can be stored, recycled and kept available during the periods of time in between the arrival of such extracellular signals.

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