Further, Palifermin which is a truncated version of keratinocyte growth factor 1 (KGF1 is FGF7) and an FDA-approved drug used to treat mucositis in patients receiving chemo-and/or radiation-therapy44, caused an increase in acinar area in histology sections and increased acinar proliferation, when injected into mouse SGs before irradiation45. Here, FGF7 is linked to mucositis.