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A four-level hierarchy of Digital Information System (DIS) stages in the peptide/RNA world. The codon reader-acceptor DIS was able to form a codon. The sequence, a memory-based DIS in the next stage, was able to link codons into pre-mRNAs. The codons in pre-mRNA and mRNA were encoded by pre-tRNA and tRNA, respectively. Finally, mRNA was decoded by translation machine to create protein chain.
