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Figure 14 | BMC Microbiology

Figure 14

From: Evolutionary relationships of ATP-Binding Cassette (ABC) uptake porters

Figure 14

Proposed evolutionary pathway and primordial sequences of the different topological types of ABC uptake systems. A (left). The proposed evolutionary pathway for the appearance of present-day ABC uptake systems. B (right). Presumed primordial or intermediate sequences and representative examples of the different topological types of ABC transmembrane porter proteins.

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