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Stereoview of the crystal lattice environment of the hNSE molecule, composed of subunits A and B. Subunit A (in red with PGA in green) forms contacts which stabilize Gly159A-Asn205B bonding and thus preference for PGA. Subunit B (in blue with PEP in purple) forms only crystal contacts which do not involve the catalytic loops (shown in yellow, right above PEP).
