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>sp|P21904|ATPF_PROMO ATP synthase B chain, sodium ion specific (EC 3.6.3.15) - Propionigenium modestum.
MAPQNMPAVSIDINMFWQIINFLILMFFFKKYFQKPIAKVLDARKEKIANDLKQAEIDKEMAAKANGEAQGIVKSAKTEA
NEMLLRAEKKADERKETILKEANTQREKMLKSAEVEIEKMKEQARKELQLEVTDLAVKLAEKMINEKVDAKIGANLLDQF
IGEVGEEK