RAC2 and synovial sarcoma: These activations temporally mimic the development of SS-like pathology within the salivary glands, with Rhoc, Cdc42, Rac3, and Rhou exhibiting early upregulation starting at 8 weeks of age, and with Rac2 and Rhobtb1 showing an upregulation at 16 weeks, an age when the adaptive response is observed in the salivary glands of these mice.