While the common ancestor of vertebrates with synovial joints is still a mystery, the oldest specimen with evidence of these ...

Immunostaining depicts collagen-2 (cyan) and nucleus (magenta) at the articulation in the little skate embryo's pelvic joint. Synovial joints are a key feature of most vertebrate skeletons ...

Immunostaining depicts collagen-2 (cyan) and nucleus (magenta) at the articulation in the little skate embryo's pelvic joint. (Neelima Sharma/University of Chicago) (CN) — Neelima Sharma, a researcher ...