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Figure 1.
Fig. 1. Electron density map at 2.1 Å and the final
structural model represented as sticks. a, final electron
density map, contoured at a 1  level, in
the region of Tyr-34 and Trp-92, also showing the putative
sodium ion. b, electron density map (1 level)
showing the presence of a structural calcium ion bridging the N-
and C-terminal ends. The figures were produced using the program
TURBO-FRODO (26).
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