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The two mutants of the moss Funaria hygrometrica (auxin-sensitive and auxin-insensitive), isolated after UV irradiation of protoplasts derived from the wild strain protonema cultures, have been biochemically characterized and found to exhibit variations in the endogenous free-pool levels of tryptophan (a precursor for IAA biosynthesis), IAA and cAMP. Both of the mutants have a several-fold higher...