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<p>Pattern formation is genetically controlled, and often involves each cell in a field sensing and responding to its position along a <a href="page.php?w=morphogen">morphogen</a> gradient, followed by short-distance cell-to-cell communication through <a href="page.php?w=cell_signaling">cell-signaling</a> pathways to refine the initial pattern. In this context, a field of cells is the group of cells whose fates are affected by responding to the same set of positional information cues. This conceptual model was first described as the <a href="page.php?w=French_flag_model">French flag model</a></p><p>
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