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Free auxin content in apple tissue. Changes in free IAA (Indole Acetic Acid) content (ng/g fresh weight; FW) in the seed (A) and cortex (B) of developing 'Royal Gala' apples over fruit development (DAFB: Days After Full Bloom). Measurements were performed on 4 and 2 biological replicates for cortex and seed samples respectively. * indicates seed sample for which only one extraction was possible. Error bars represent standard error of the mean.
