<sod>Using insights gleaned from [[Archaea|archaeal]] genomes, Erives elaborated and described a [[stereochemistry|stereochemical]] model of "proto-anti-codon RNAs" (pacRNAs).<ref name=pacRNA/> The pacRNA model ascribes a predetermined combined origin for the universal [[genetic code]] (''i.e.'', the codon table), the biogenic amino acids, and the their exclusive [[homochirality]] in life. The model implies that early [[RNA world]] was  an aminoacylated RNA world and that [[proteinogenic amino acid]]s arose because of compatible interactions with nucleotide-based polymers. The pacRNA model explicitly lists possible interactions between various anti-codon di-nucleotide and tri-nucleotide sequences and specific amino acids. When the nucleotides are D-ribose based, L-amino acids are preferred. The pacRNA model may also explain why extant [[tRNA]]s are heavily [[RNA modification database|modified]] in all [[three-domain system|three domains of life]].<eod>
<sod>Using insights gleaned from [[Archaea|archaeal]] genomes, Erives elaborated and described a [[stereochemistry|stereochemical]] model of "proto-anti-codon RNAs" (pacRNAs).<ref name=pacRNA/> The pacRNA model ascribes a predetermined combined origin for the universal [[genetic code]] (''i.e.'', the codon table), the biogenic amino acids, and the their exclusive [[homochirality]] in life. The model implies that early [[RNA world]] was  an aminoacylated RNA world and that [[proteinogenic amino acid]]s arose because of compatible interactions with nucleotide-based polymers. The pacRNA model explicitly lists possible interactions between various anti-codon di-nucleotide and tri-nucleotide sequences and different amino acids. When the nucleotides are D-ribose based, L-amino acids are preferred. <eod>