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Normalized serine proteinase activity in 15 transformants growing in TM broth with humic fraction. A15 is the wild type strain, ATA2 and ATA4 are control transformants. Error bars are standard deviation of the mean of five biological replicates, with significance tested by Mann‐Whitney. A. bisporus transformants harbouring the Spr1 sense (S), anti‐sense (AS) and untranslatable sense (ST) constructs.
