“…Besides helicases, various proteins such as nucleases, topoisomerases, RNA polymerases, ssDNA binding proteins, and RNA binding proteins ( Table S1 ) work in concert to preserve biologically important R-loops while ensuring harmful R-loops are resolved quickly. For example, yeast RAD27 and human FEN1, a flap endonuclease, cleave the RNA of R-loop structures ( 131 , 132 ). Additionally, endonuclease Sae2/CtIP prevents R-loop accumulation in eukaryotic cells ( 133 ).…”