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Loop β4-α4, β5-α5, and loop 290 conformations of apo YahA-EAL (A), YahA-EAL·Mg2+ (B), and YahA-EAL·cdG·Ca2+ (C). The distinct interaction patterns between the anchoring glutamate (Glu-235) and loop β5-α5 are represented by broken lines in brown.
