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ABC transporter permease subunit
The alignments cover the most conserved region of the proteins, which is thought to be located in a cytoplasmic loop between two transmembrane domains. The members of this family have a variable number of transmembrane helices. (from Pfam)
putrescine ABC transporter permease PotI
putrescine ABC transporter permease PotI is required for the activity of the bacterial periplasmic transport system of putrescine
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