A protein found in connective tissues like skin, ligaments, and blood vessels that allows them to stretch and return to normal shape.
From elastic + -in (chemistry suffix for proteins), coined in the 19th century when scientists isolated this natural elastic protein from tissue.
Elastin is why your skin bounces back when you pinch it—it's one of the most elegant proteins nature made, and it literally defines the 'elastic' in elasticity!
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