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SWISS::Ref represents a single reference of a SWISS-PROT + TREMBL entry as specified in the user manual http://www.expasy.org/sprot/userman.html .

SWISS::BaseClass.pm

"RN"
The reference number.
"RP"
The RP line(s), unwrapped as a string.
"RC"
Zero or more RC lines.

Data structure: {Token}[qualifier1, qualifierN].

A hash of arrays. Hash keys are the RC tokens, array elements are the qualifiers for that token.

"RX"
References to bibliographic databases.

Data structure: {Database}[identifier1, identifierN].

A hash of arrays. Hash keys are the names of bibliographic databases, array elements are the identifiers of the reference for that database.

"RG"
The RG line(s), unwrapped as a string.
"RA"
The list of Authors.

An object of type SWISS::ListBase.

"RT"
The publication title, unwrapped as a string.
"RL"
The RL line.

Data structure: String.

Add a RX line 'MEDLINE; nnnnnnnn.' to the reference.
Add an author to the RA line of the reference.
Sort elements of the RC line alphabetically.