Issue/One ID per record

email:should we have redundant identifiers for the same record (answer should be no)

But consider the following entries in LSRN:

HGCN, HGNC_name (both redirects are broken, btw, but that's aside the point). These would be redundant ways to get at the same record.

I propose we do not (knowingly) have such cases as they harm the ability to do data integration.