lack anal teeth are outfitted with tools to defend themselves

But even sea cucumbers that lack anal teeth are outfitted with tools to defend themselves.They evade threats and launch counter-attacks using their mutable collagenous tissue, or MCT.This gel-like tissue contains bundles of collagen, called ibrils.Proteins can interact with these fibrils to slide them together,stiffening the tissue, or apart, softening it.