A discussion of cell communication and signalling, including an overview of the purpose of cell signalling, the main types of signals, and applications such as hormones, neurotransmitters, and cytokines. The difference between G protein-coupled receptors, enzyme-linked receptors, and intracellular receptors is also considered, concluding with a summary of the process of signal transduction and the role of second messengers. Recommended pre-listening is Episode 116: The Cell Membrane.

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