About the Cover eGFP signal of bone marrow--derived cells that have homed to a submandibular gland 130 days after irradiation and α-smooth muscle actin (red) costaining on salivary myoepithelial cells. The nuclei are stained with DAPI. Postirradiation mobilization of bone marrow cells using G-CSF reduces damage to the salivary glands. For further details, please see Lombaert et al. on page 1804 in this issue.