A new treatment that blocks an aging-related protein restored lost cartilage in old mice and helped prevent arthritis after knee injuries. Human cartilage samples showed similar signs of regeneration, raising hopes for a future drug that could repair joints instead of replacing them.
They turn into a soup-like homogenate. As is natural in the life cycle of a lab mouse.
And if they weren’t euthanized they would almost certainly die of horrible horrible cancerous tumors. Not because of anything the labs do, but because it’s a crime against nature for a mouse to live past maybe 2 years.