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	/*
		{
		text: "1. Generation of a signal"
		},
		{
		text: "2. Detection of the signal by a specific receptor"
		},
		{
		text: "3. Signal transduction  "
		},
		{
		text: "4. Cellular response"
		},
		*/
		{
		text: "The signal provides information to the target cell from another cell or from the surrounding environment."
		},
		{
		text: "Most receptors are expressed on the surface of cells, but some are inside cells. Crucially, receptors provide specific binding sites for their cognate signalling molecules."
		},
		{
		text: "The engagement of a receptor by an appropriate signalling molecule evokes changes in the receptor so that transduction processes are stimulated."
		},
		{
		text: "Activation of transduction processes leads to a cellular response. The response depends on a change in the activity of effector molecules such as transcription factors, enzymes and ion channels."
		}],				
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