| How much is a Second Class stamp? super p force sverige The researchers, based at the University of Grenada, worked from primordial fossils that had trace imprints of thioredoxin’s structure. Early specimens of all three domains of microbial life—bacteria, eukaryotes, and prokaryotes—exhibited it in their biochemistry. In an article that the journal Structure published Thursday, the researchers wrote to truly understand ancient life, we need to examine the molecular structures as they existed then, not as they exist today. Molecules, like living species, can change much over millions or billions of years.
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