How snake embryos coil.
Snake embryos consistently coil right-handedly during early development, with 39 species showing nearly fixed coiling orientation due to tissue growth dynamics.
- Why it matters: Understanding the biological basis of embryonic coiling addresses how snakes develop their characteristic elongated bodies and may reveal general principles of limbless vertebrate development.
- What they did: The study examined coiling directions across multiple species and developmental stages, analyzing tissue growth patterns and the physical separation of the gut from the body axis.
- The result: Findings suggest early coiling is passively determined by yolk asymmetry and driven by differential growth rates, enabling snakes to resolve developmental conflicts and achieve their distinctive body plan.