Issue
There are nonstandard amino acids in the Benchling amino acid list.
Environment
Molecular Biology application
Resolution
We support these nonstandard amino acids: B, J, O, U, X, Z
Nonstandard amino acids are amino acids that have been chemically modified after being incorporated into a protein. They occur in living organisms but aren't found in proteins.
The molecular weights are calculated and can be used as ambiguous codons together or alone in a sequence. To learn more about these amino acids, visit How are protein characteristics calculated? and the ChemPep list of standard amino acids.