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Alignment of 5α-reductase proteins. The amino-acid sequences in single-letter code of the human 5α-reductase 2, 5α-reductase 1 (ref. 4), and rat 5α-reductase6 proteins are aligned. Identities between two or more enzymes are boxed in black. Numbers above the sequences refer to the human 5α-reductase 2 protein.
