How can I choose the translation letter code format shown in Sequence view?
Choose 1- or 3-Letter Amino Acid Codes

Click the "Use 3-letter amino acid codes" button in the side toolbar to change the translation letter code format from 1-letter to 3-letter codes.

The "Use 3-letter amino acid codes" button background is gray when 3-letter codes are shown.
Review the Letter Codes

To review the protein letter code abbreviations, click Tools → Letter Codes.

Alternatively, mouse over the amino acid letter code to review the letter code abbreviation, the position of the amino acid in the ORF, and a synopsis of the ORF data.