Acknowledgement
This work was supported by grants from the National Research Foundation of Korea (NRF-2021R1A2C1010334 to CK, NRF-2020R1I1A1A01074292 to WJ, NRF-2017R1A6A3A11032327 to WJ). We thank the Bloomington Drosophila Stock Center (BDSC) and Vienna Drosophila RNAi Center (VDRC) for flies, and the Drosophila Genetic Resource Center (DGRC) for Bowl cDNA. We are grateful to F. Michon for sharing Lin28df30, T. Guy for Upd-Gal4, and N Sokol for Lin28Δ1.
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