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In page Central dogma of molecular biology:

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Some proteins are synthesized by nonribosomal peptide synthetases, which can be big protein complexes, each specializing in synthesizing only one type of peptide. Nonribosomal peptides often have cyclic and/or branched structures and can contain non-proteinogenic amino acids - both of these factors differentiate them from ribosome synthesized proteins. An example of nonribosomal peptides are some of the antibiotics.[citation needed]