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Lineage-tracing embryonic glands. Using Cre mouse lines that label the salivary gland anlagen from embryonic day 9.5 (E9.5) to E10.5 lineage traces to the entire gland, confirming that these cells give rise to the entire gland. Inducing lineage tracing from E11.5 to E12.5 gives different results depending on the cells that are traced. MEC, myoepithelial cell; SLG, sublingual gland; SMG, submandibular gland.
