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Extracellular Messenger Molecules (a.k.a ligands) – A method of stimulating cells from far away from the messaging cells (endocrine signaling) to neighboring cells (paracrine signaling) to as close as its own self (autocrine signaling)

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Ligands – Out of 3 different cell messaging mechanisms, they are referred to most of the time as hormones (see endocrine signaling), because more noticeable ligands are ones with a longer half-life. The other two are referred to as local mediators (see autocrine and paracrine signaling).

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transcription factor

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