STRING 9.05 
There are several matches for 'P75691'.
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 organism  protein 
 Escherichia coli K12_MG1655 
yahK - predicted oxidoreductase, Zn-dependent and NAD(P)-binding
 Escherichia coli K12_W3110 
yahK - predicted oxidoreductase, Zn-dependent and NAD(P)-binding