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doi: 10.1371/journal.pone.0039191 122 MedemaM

doi:10.1186/1742-4933-2-17

They may contain contaminants, have lower purity, and lack sterility testing

10.1038/s41598-018-37552-0 11 CantaA.ChiorazziA.PozziE.FumagalliG.MonzaL.MeregalliC.et al (2020)
