“Insertion of Three Genes Encoding Polyhydroxybutyrate into Escherichia Coli BL21 As the First Host: A Preliminary Exploration of Plasmid Transformant”. Biosaintifika: Journal of Biology & Biology Education, vol. 18, no. 1, Apr. 2026, pp. 93-103, https://doi.org/10.15294/biosaintifika.v18i1.33054.