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Schematic diagram demonstrating how the gradient of FGF stimulation affects the anteroposterior patterns of differentiation in the lens. The lens epithelium is frequently divided into two zones, the central lens epithelium (CE) and the germinative zone (GZ) which extends to the equator of the lens (EQ). The transitional zone (TZ), just posterior to the equator is where lens epithelial cells differentiate into fiber cells. Modified from (Lang and McAvoy 2004).
