This table provides a key to the Extended IUPAC Encoding of Amino Acids defined by NCBI.
Usage
data(NCBIeaa)
Format
A data frame with 28 observations on the following 4 variables:
Value
NCBI code
Symbol
One-letter abreviation of amino acids
Symbol3
Three-letter abreviation of amino acids
Name
Amino acids
Details
The official IUPAC amino acid code has some limitations. One is the lack of symbols for termination, gap, or selenocysteine. Such extensions to the IUPAC codes are also commonly used by sequence analysis software. NCBI has created such a code which is simply the IUPACaa code above extended with the additional symbols.