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Autocrine function describes a process where a cell secretes a substance that acts on surface receptors of the same cell. This is a form of chemical signaling within multicellular organisms.12

In autocrine signaling, molecules produced by a cell bind to receptors on that same cell, influencing its own behavior. This is distinct from paracrine signaling, where signals act on nearby cells, or endocrine signaling, where signals travel through the bloodstream to distant targets. Autocrine signals are present in high concentrations and work in the immediate vicinity of the producing cell. This mechanism is important for cell growth and can be involved in processes like malignant transformation.31

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