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Structure of Δ-isoform LNS domains from β-NRX1 and β-NRX2. The ribbon diagrams are colored in a rainbow from blue to red from N- to C-terminus. β-strands are numbered, and the bound Ca2+ ion in the NRX1 structure is shown as a green sphere. The α-carbon of residue 200, the position of splice insertion 4, is shown as a magenta sphere. An eight residue stretch in the β9-β10 loop of NRX2 is disordered and indicated as a dashed yellow line.
