[BiO BB] B, Z, N, X in refseq

Fei Li lifei03 at gmail.com
Mon May 30 21:47:57 EDT 2005

I am using the refseq from Genbank.   There are some strange
characteristic such as B, Z, N, X in the protein sequence.

Can anybody tell me what these "bad " characteristics means?  What
should I do if my program compain these bad characteristics.  Remove
them or replace them with some specific amino acid?



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