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Sequencing strategy for pXA3. The spacer is represented by a single line, 17S RNA is represented by a black bar, and 25S RNA is represented by a crosshatched bar. The two repeat regions in the spacer are indicated at the top of the map by Ia to Ic and IIa to IIc. Regions were subcloned and sequenced as indicated below the map. The region labeled “Sogin 17s” represents sequences from the work of Sogin and Elwood (11).
