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After a snail mucus skin care boom in South Korea, the product—also referred to as snail mucin or secretion—was widely shared on social media.

One particular item took off — a snail mucin essence from popular Korean brand COSRX.

Even if the tear supply is adequate, a mucin deficiency can impede wetting of the cornea and damage its surface.

A lung secretion induces mucus production, and the researchers began by testing its individual components to see which ones upregulated the genes for the proteins mucin 5B and mucin 5AC — two major constituents of mucus.

Scientists have uncovered many ways that mucin proteins work to keep body surfaces clean and protected, and are continuing to parse the complex interactions the molecules have with microbes.