Some details are not immediately obvious. Things that aren't immediately obvious such as the SV record, or the funny XX record, also aren't very important. "Describe the EMBL database SV record" is the least likely exam question I can imagine.

This question can further be discussed with the assistants. If they don't know what a certain code stand for, then it is an unimportant one...

Traditionally the students only have a problem figuring out that CC stands for Curator Comment. A curator is involved in the preparation of every sequence entry in SwissProt. Sometimes the curator wants to add some information not foreseen in the SwissProt format, and for that he or she can use the CC records (lines).

Secondary accession numbers: One reason for allowing the existence of several accession numbers is to allow tracking of data when entries are merged or split. For example, when two entries are merged into one, a "primary" accession number goes at the start of the list, and those from the merged entries are added after this one as "secondary" numbers.

Example: AC X56734; S46826;

Similarly, if an existing entry is split into two or more entries (a rare occurrence), the original accession number list is retained in all the derived entries.

If you want to learn much more about SwissProt (and in much greater detail), then feel free to look-up the SwissProt entries in YouTube.

Key Write here in a few words at which information this key points
ID  Identifier, name of the entry/file
AC  Accession code; unique and invariable identifier
DT  Crucial dates, like date of deposition and/or correction
DE  Description of the molecule
KW  Keywords
R*  Literature
DR  Pointers to related entries in other databases
FT  Features (can be very many...)
SQ  Sequence statistics followed by actual sequence...