Find Sequence

Choosing Select... Sequence... opens an interface for specifying an amino acid and/or nucleotide sequence; a similar interface is included in the Sequence Panel.

There are two sections arranged as index cards; clicking the tab for a card brings it to the front.

The Subsequence section allows the sequence to be specified as a string of one-letter codes. Case is not important. Sometimes B is used to indicate either aspartic acid (D) or asparagine (N) and Z is used to indicate either glutamic acid (E) or glutamine (Q). These interpretations of B and Z can be turned on or off.
The PROSITE pattern section allows the sequence to be specified with PROSITE pattern syntax. Residue codes must be capitalized; extended syntax involving an asterisk, e.g. <{C}*>, is not supported.

It is possible to Force interpretation... as either protein or nucleic acid sequence, that is, look for the string or pattern in only the specified sequence type. When this option is off, occurrences in all sequence types (protein, DNA, and RNA) will be considered matches.