Assertion: mussel's thread | /r/CapableOf | harden in water
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Source sentences:
text: Some species, such as Mytilus, the blue mussel, Arca, the ark shell, Pecten, the pilgrim's scallop and Pinna, the pen shell, have got a byssus gland at their foot's end, producing a thread that hardens in water and can be used to fasten the mussel to the ground.