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Alignment of the 59-be of aacCA family gene cassettes. Bases in lowercase letters are derived from the beginning of the cassette. The core sites are in boldface type and are designated 1L, 1R, 2L, and 2R according to reference 23. The extents of the simple sites (LH, left-hand; RH, right-hand) and the 59-be are indicated by bars (bottom). Sequences are from sources given in Fig. 1.
