About UIDs

[Faramir]

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I have a question about the UID associated to the key: Are they placed
in the public key, or in both private and public keys?

And, if I have a key with 2 UIDs, and I sign another key (lets say, I
sign Alice's key), will be both UIDs be displayed in the signatures, or
just the one that was my primary UID at the moment when I signed Alice's
key?

Best Regards
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