Which mechanism precisely controls sequential molting stages in holometabolous insect metamorphosis?

💡 Explanation

When ecdysone hormone pulses trigger molting, ecdysone receptor isoform switching precisely controls which specific developmental genes are triggered because differential receptor binding recruits diverse co-factors leading to varying transcription programs at specific stages. Therefore isoform switching precisely regulates molting stages, rather than merely degradation rate, proliferation rate, or activation thresholds which lack fine developmental control at the molecular level.

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