Trojan Mucus: How Clownfish Outsmart Sea Anemones

In this deep dive, we uncover the chemical handshake that lets clownfish live safely among venomous sea anemones. We explain how their mucus masks the anemone's sting by keeping levels of the key sugar NU5A (5-N-acetylneuraminic acid) low, how this protective coat is acquired during metamorphosis, and why environmental change threatens this fragile partnership. Along the way we connect the biology to themes of information flow and system resilience — and why tiny molecules can decide big ecological fates.

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