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Auxins and cytokinins are two of the most important classes of plant hormones that play crucial roles in regulating plant growth and development. Auxins, primarily indole-3-acetic acid (IAA), are synthesized mainly in the shoot apical meristem, young leaves, and developing seeds. They are known for their role in cell elongation, apical dominance, root initiation, and tropic responses. Auxins promote cell elongation by increasing the plasticity of the cell wall through activation of proton pumps, ___ _________ __________ ____ ___ ___.
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