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Then, a positive and counterselection cassette, PZ (only 1.5 kb in length), was constructed by combining pheS AG -3 and the zeocin resistance gene. A PZ- and PCR-based strategy was used to create the unmarked deletion of glgA1 or the whole smmo operon in M. buryatense 5GB1C and Methylotuvimicrobium alcaliphilum 20Z. The positive rates were over 92%, and the process could be accomplished in as few as eight days. Copyright © 2020 Liu, He, Zhu, Cheng, Hong and Yan.In the fungal pathogen Aspergillus fumigatus, resistance to azole antifungal

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