Magnetotactic bacteria can form magnetofossils like magnetic nanocrystals as observed in the Martian meteorite ALH84001, which held a special place in the field of astrobiology primarily in the early 90s. While the flourishing of interest in magnetotactic bacteria has waned over time, a resurgence of magnetosome formation has led to a renaissance of magnetotactic bacteria (abbreviated as MTB) in astrobiology.
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Source: Phys.org