https://motherboard.vice.com/en_us/article/bj9x3a/scientists-discover-42000-year-old-liquid-blood-in-preserved-foal

Scientists in Russia have extracted liquid blood from a horse that is more than 42,000 years old.

The blood and tissue from the horse’s body were extracted with the intent to eventually clone the horse—an accomplishment that would give legitimacy to other attempts at bringing back extinct species.