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In this paper we analysed the endogenous IAA levels in carrot cell cultures and in cell culture medium. Free IAA and its conjugates (esters and amides) were measured in cell cultures exposed to different concentrations of 2,4-D (nil, 2,3 and- 92 μmol/L). The three culture conditions determine different physiological conditions of the cell cultures: somatic embryogenesis, unorganised growth and growth...