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Brockbank WJ, Lynn KR (May 1979). "Purification and preliminary characterization of two asclepains from the latex of Asclepias syriaca L. (milkweed)". Biochimica et Biophysica Acta (BBA) - Protein Structure. 578 (1): 13–22. doi:10.1016/0005-2795(79)90107-7. PMID36921.