Once a molecule model has been chosen in the left side of the Model Panel, clicking the sequence... button in the right side of the panel brings up a window showing the amino acid or nucleotide sequence of each chain in the model. Only bonded chains of more than one residue are shown. Each chain is named according to its chain ID in the input file; if there is no chain ID, the chain is called the Principal chain.
Placing the cursor over a residue in the sequence shows the residue number and name above the sequence. When the checkbox designated Sequence selection selects graphics is activated, selecting a sequence segment within the sequence panel causes selection of the corresponding residues in the main graphics window. When the checkbox designated Graphics selection selects sequence is activated, a selection in the graphics window causes selection of the corresponding segment(s) within the sequence panel. Both checkboxes are on by default.
Note that Select... Sequence... provides another way of selecting contiguous segments by sequence. In that case, the sequence to be selected must be typed in, since the sequences of the open models are not shown.
Find Subsequence... brings up a dialog for finding and selecting occurrences of a string of residues in any of the sequences. Close dismisses the Sequence Panel; Help brings up a browser window containing this manual page.