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Maulidiya, A.U.K. , Indrawati, I., Dafik, D., Waluyo, J. and Sugiharto, B. 2025. The development of RBL-STEM learning materials to improve the students’ combinatorial thinking skills in solving transgenic sugarcane confirmation problem using PCR technique. International Journal of Innovative Research and Scientific Studies. 8, 5 (Aug. 2025), 1685–1699. DOI:https://doi.org/10.53894/ijirss.v8i5.9232.