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Lateral root formation is initiated in pericycle (located between the endodermis and vascular tissue) of the root system, and begins with a process referred to as priming. In this stage, you have rhythmic bouts of gene expression and responses to auxin. If sufficient signaling is present, pre-branching sites are developed in basal portions of meristematic tissue that are stable in the presence of high auxin environments. These pre-branching sites go on to form the pericycle founder cells after

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