Self-replication. Even peptides do it.
Kauffman
S
S
D000596:Amino Acids / Q000378:metabolism; D002384:Catalysis; D004268:DNA-Binding Proteins; D005656:Fungal Proteins / Q000737:chemistry; D010452:Peptide Biosynthesis; D011494:Protein Kinases / Q000737:chemistry; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors / Q000737:chemistry
D000596:Amino Acids; D004268:DNA-Binding Proteins; D005656:Fungal Proteins; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors; D011494:Protein Kinases