Define or explain: Gibberellins.

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(N/A) Minute quantities of gibberellins profoundly stimulate the growth of many plants.
The major sites of $GA$ production in plants are embryos,roots,and young leaves close to the shoot tip.
Gibberellins are chemically gibberellic acid $(GA_3)$.
They are of isoprenoid nature and possess the same general carbon skeleton.

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