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it would be useful to distinguish between the case "PDB has been contacted and there is some kind of communication (try again later)" and "we already know there is no relevant PDB (no 'try again later')".
Instead of
it would be useful to distinguish between the case "PDB has been contacted and there is some kind of communication (try again later)" and "we already know there is no relevant PDB (no 'try again later')".
As suggested by Gos.