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Expression in response to ammonia availability. Levels of mRNA were measured using RT-qPCR. The amount of mRNA is given as an arbitrary value standardised to sigA expression values. The mean±standard deviation of at least three independent samples assayed in triplicate is given. Asterisks indicate significant induction in low ammonia (Student's t-test p<0.05). Key: black bars—low ammonia; white bars—high ammonia.
