-ARs are key regulators in embryonic development. They modulate actomyosin relaxation, allowing epithelial tissues to stretch during body elongation, as detailed in Cell.com . 4. Summary of Subtype Characteristics Primary Location Key Physiological Effect β1beta sub 1 Heart, Adipose tissue Increases heart rate & contractility β2beta sub 2 Smooth muscle (Airways), Immune Cells Bronchodilation, Vasodilation β3beta sub 3 Adipose tissue, Urinary bladder Lipolysis, Thermogenesis

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with specific beta-blockers, allowing for state-specific modeling (active vs. inactive). 2. Emerging Roles in Disease Pathogenesis -adrenergic signaling (specifically

-ARs are enriched in specialized zones with scaffold proteins (SAP97, AKAP79/150), while β2beta sub 2