Researchers at Friedrich-Alexander University Erlangen-Nuremberg and University Hospital Erlangen reported that mouse brain tissue could be frozen using vitrification, then thawed with preserved function in at least part of the tissue. The strongest public reporting says only a small portion of brain tissue was revived, but neurons were still able to exchange electrical signals and retained processes linked to memory and learning; related coverage says the study was published in Proceedings of the National Academy of Sciences on 3 March 2026, with brain slices cooled in liquid nitrogen at −196 °C and whole mouse brains held vitreous at about −140 °C for up to 8 days.
The technical significance is that vitrification is moving from simple structural preservation toward partial functional preservation of mammalian neural tissue, which is far more relevant to long-term biospecimen storage than conventional freezing. If reproducible, this reduces the risk of ice-crystal destruction in archived tissues, supports future lunar biobanks operating at deep cryogenic temperatures, and strengthens contingency options for preserving neurological tissue, organoids, and other fragile biological systems through multiday or longer cold-chain disruptions.
Ark priority should be to track whether the method scales from mouse hippocampal slices to whole brains, whether post-thaw synaptic function and long-term potentiation remain stable across more tissue and longer storage durations, and whether the cryoprotectant chemistry can be adapted for lunar infrastructure. The team should also monitor the exact cooling, warming, and temperature-hold protocols, because controlled rewarming is likely as mission-critical as freezing for any Ark preservation program.