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Branching morphogenesis. Typical branching pattern over developmental time in the (a) lung, (b) ureteric bud, (c) salivary gland, (d) prostate, (e) mammary gland and (f) pancreas. The epithelium is shown in black, the mesenchyme in red, the fat pad in the mammary gland in green and the lumen in the pancreas in yellow.
