Keefer, LM., Piron, MA., De Meyts, P., Gattner, HG., Diaconescu, C., Saunders, D., & Brandenburg, D. (1981). Impaired Negative Cooperativity of the Semi-synthetic Analogs Human [leub24]-insulin and [leub25)-insulin. Biochemical and Biophysical Research Communications, 100(3), 1229-1236. https://doi.org/10.1016/0006-291X(81)91955-0 (Original work published 1981)