Four different histidine auxotrophs of Neurospora, a eukaryotic mold, are tested fol histidine and histidine precursors. The data are shown in the following table. A plus sign (+) means growth. Which conversion step does Mutant 4 catalyze? Hint: first order the dataset and write out the precursors. Compound SR T Q Tryptophan Matant 1 Mutant 2 Matant 3 + Mutant 4 Rto Q O QtoT O Tto Q O Tto tryptophan O sto T

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