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<p>Many of the signal molecules that convey information from cell to cell during the control of cellular differentiation are called <a href="page.php?w=growth_factor">growth factor</a>s. Although the details of specific <a href="page.php?w=signal_transduction">signal transduction</a> pathways vary, these pathways often share the following general steps. A ligand produced by one cell binds to a receptor in the extracellular region of another cell, inducing a conformational change in the receptor. The shape of the cytoplasmic domain of the receptor</p><p>
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