The putative amino acid permease (PAAP) family (TC# 2.A.120) belongs to the APC superfamily.[1] The PAAP family consists of many proteins, all of a uniform topology with a 5 + 5 TMS repeat in a 2 + 3 + 2 + 3 arrangement. These proteins show similarity to members of the LIVCS family (TC# 2.A.26) in the APC Superfamily.[1][2] A representative list of recognized members of the PAAP family is available in the Transporter Classification Database.
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