Déjà Vu v1

Déjà Vu is a modern replacement for Nearest-cell (Ramraj et al., 2012), which is no longer available. Collecting data from a crystal that’s already in the PDB wastes beamtime — this tool catches that before you commit to a full dataset. Both your cell and the entire PDB X-ray index are compared in Niggli-reduced form (canonical a ≤ b ≤ c), making the search robust to axis reordering, missed symmetry, and enantiomorphic settings, with every hit labelled by its space-group relationship to your query. Nearest-cell reduced to P1 and tested all six axis permutations via MATFIT rotation superposition; Niggli reduction gives a unique canonical form directly — no enumeration needed. I wanted a fast, browser-accessible alternative — no original crystallographic science was performed by me. — Jan Gebauer