Cendana, K.S. et al. 2026. A Comparative Study of Penicillin G Acylase Expression in Two Escherichia coli Strains: BL21 (DE3) and Arctic Express. HAYATI Journal of Biosciences. 33, 3 (Mar. 2026), 596–604. DOI:https://doi.org/10.4308/hjb.33.3.596-604.