Signaling is the initial event associated with many key cellular functions, from the correct timing of cell division, to the decision to migrate in a particular direction, and even to whether a cell needs to go through programmed cell death.

Learn how cells receive, process, and respond to chemical and mechanical signals from their environment. Explore the types of receptors, second messengers, and signaling pathways that mediate cellular communication.

Learn how cells communicate and respond to stimuli from their environment using chemical, mechanical, or electrical signals. Explore the three stages of cell signaling, the four types of cell signaling, and their examples with a diagram.

Cell signaling requires not only extracellular signal molecules, but also a complementary set of receptor proteins in each cell that enable it to bind and respond to the signal molecules in a characteristic way.

Learn about the process of cell signalling, how cells communicate with each other and respond to their environment. Explore the different types of cell signalling molecules, receptors and pathways, and their functions in various biological processes.

The binding of most signaling molecules to their receptors initiates a series of intracellular reactions that regulate virtually all aspects of cell behavior, including metabolism, movement, proliferation, survival, and differentiation.

Cell signaling can result either from the direct interaction of a cell with its neighbor or from the action of secreted signaling molecules (Figure 13.1). Signaling by direct cell-cell (or cell-matrix) interactions plays a critical role in regulating the behavior of cells in animal tissues.

Explore how cells give and receive messages with their environment and with themselves, and how cell signaling affects development, function, and disease. Learn about the mechanisms, methods, and applications of cell communication in biology and computational biology.

Cell signalling is the mechanism by which stimuli are transmitted via a signalling cascade to effector molecules that orchestrate the appropriate response.