updating sequence data in EMBL - how?

[DOROTHY LOWRY]

Can someone please advise me on the proper procedure for updating a sequence
that has already appeared in the databank?  For instance, if I submit
a sequence that is 500 bp long.  Then, there is new data for that 
sequence that extends it to (in total) 700 bp. or whatever...

How do I submit this 'new' sequence to the databank?

In actual fact, I am writing this for a friend.  The databank is EMBL.
The sequence was already submitted.  After reading the Authorin 
documentation, we came to the conclusion that we could use Authorin to
generate a new sequence entry, then mail that entry to update at embl-etc.
with something like: update of sequence 'accession number'; new data 
from x to y bp.

Is this that proper procedure?  Any advice (particulary EMBL) associated
would be appreciated.

Dorothy
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Dorothy Lowry                                         dlowry at cmu.unige.ch
Dept. Medical Biochemistry
University of Geneva                                  +41 22 702 5490
1, rue Michel Servet, 1211 Geneva 4, Switzerland
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