compseq: is U an amino acid

[JAEN (Jacob Engelbrecht)]

I have been using compseq for protein sequences and wondered why 'U' is
reported as an amino acid?
I looked in the code (nucleus/embnmer.c) and found it was specifically
accounted for, whereas 'X' which in many databases  as unknown is not
specifically accounted for.

Would it not make sense to have options which made specific symbols part of
the alphabet or left them out: 
-leaveout XU or -include BZXU

Jacob Engelbrecht, Phd
Insulin Research
Novo Nordisk
6A1.038 Novo Alle
DK-2880 Bagsvaerd
Denmark
tel: +45 4442 4403
mail: jaen at novonordisk.com

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