Auxins

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The principal natural auxin, widely used to stimulate root initiation, callus formation, and morphogenesis. 

A stable synthetic auxin, highly effective for adventitious root induction and vegetative propagation. 

A synthetic auxin with high stability, promoting rooting, callus growth, and organogenesis in vitro. 

An auxin-like regulator enhancing cell elongation, root induction, and callus proliferation.