Joanna MaselWe identified protein domains in LUCA (#LastUniversalCommonAncestor). Their distinctive #AminoAcid usage reveals the order amino acids were added to the #GeneticCode, based mostly on size. Older proteins hint at earlier alternative codes. 1/15 https://www.pnas.org/doi/10.1073/pnas.2410311121 #astrobiology #phylostratigraphy #sulfur #metalloproteins
Trends in mean properties as a function of #phylostratigraphy age also match those expected from simulations of inferred #LossRates. 9/11