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Protein B. Protein A. A. B. Protein B. Protein A. 1). B. A. 2). A. A. 3). A. B. 1). B. A. B. i.e. B has N-terminal extension. A. 2). B. A. B. i.e. first and last domains are. duplicated. A. 3). A. A. B. i.e. this time it is A that has the. N-terminal extension. B.
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