2026. 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. 18, 1 (Apr. 2026), 93–103. DOI:https://doi.org/10.15294/biosaintifika.v18i1.33054.