Kurzchalia and his colleagues initially studied a Caenorhabditis elegans, in 2018.

Source: https://www.zmescience.com/ecology/animals-ecology/these-worms-were-resurrected-after-46000-years-frozen-in-the-siberian-permafrost/

“This led us, for instance, to understand that they cannot survive without a specific sugar called trehalose,” Dr. Kurzchalia said.

Source: https://www.nytimes.com/2023/07/29/science/roundworm-nematodes-siberia-permafrost.html