Joseph Ellaway et al. 2023 describes a pipeline for clustering data from this repository via GLOCON score for comparison to entries in an AI-generated repository. In 2014, mmCIF supplanted this repository’s use of its namesake file format, which contains numbered “REMARK” records, like “REMARK 350” to specify matrix transformations, and “SEQ·RES” records to specify chains. Lesk and Hardman’s earliest-published (15[1])automatic (*) ribbon diagram generator used this repository as (10[1])input. (10[1])RCSB is the US-based host of this repository whose file format is followed by the primary output of AlphaFold and contains (10[1])“ATOM” records to describe (10[1])position (10[1])coordinates (10[1])that are typically (-5[1])determined (10[1])via X-ray crystallography. For 10 points, name this largest database in structural biology. ■END■ (10[1])