Kim, S. ., Ryu, S. ., Lee, S. ., Lee, Y. ., , Huh, J. ., … Chang, K. . (1969). Instability of toxin A subunit of AB(5) toxins in the bacterial periplasm caused by deficiency of their cognate B subunits. Biochimica Et Biophysica Acta. https://doi.org/10.1016/j.bbamem.2011.06.016 (Original work published)