Video 2. Opto-G3BP1 assembles light-dependent cytoplasmic clusters.
U2OS cells stably expressing Opto-G3BP1 were stimulated with a single 5-msec pulse of 488 nm blue light (power density ~2.5 MW/cm2) in a defined ROI. Opto-G3BP1 assembles highly dynamic, liquid-like cytoplasmic granules, and these granules spontaneously disassemble over a period of approximately 5 min. See Video 1 for corresponding Opto-Control condition.