It is essentially the same as the standard code, however there are some variations in alternative start codons.
In addition, GUG and UUG starts are documented in archaea and bacteria.
[6][7][8][9][10][11][12] In Escherichia coli, UUG is estimated to serve as initiator for about 3% of the bacterium's proteins.
[18] The NCBI raw format is as follows, with UUG, CUG, AUU, AUC, AUA, AUG, and GUG marked as possible initiators:[19] Initiation at AUC and AUA is not addressed in the NCBI description text, but both are indeed known to occur in E.
[20] This article incorporates text from the United States National Library of Medicine, which is in the public domain.