Update README.md

README.md

@@ -18,11 +18,9 @@ configs:
     path: data/test-*.parquet
 ---
 
-# UniRef50 Shard Index
+# UniRef50
 
-This dataset contains the original UniRef50 FASTA shards plus a viewer-friendly file/shard index. The full sequence data is stored as 61 `.fasta.zst` shards and the per-record metadata JSONL is very large, so the default Dataset Viewer table indexes repository files instead of expanding all 60,315,044 sequence records.
-
-Use the original `sequences/.../shard-*.fasta.zst` files for complete FASTA records. Use the default Parquet table for Dataset Viewer previews, source discovery, file sizes, and download patterns.
+UniRef50 is one of three clustering levels in the UniProt Reference Clusters (UniRef100 / UniRef90 / UniRef50). It is produced by clustering UniRef90 cluster representatives with MMseqs2 using a 50% sequence identity threshold and an 80% length overlap, yielding a substantially condensed view of UniProtKB plus selected UniParc records. UniRef50 is the workhorse search and training database for protein ML: AlphaFold2 and most protein language models (ESM, ProtTrans, etc.) use UniRef50 or its close cousin UniRef90 as the primary diverse protein corpus, since the redundancy reduction gives a much flatter sample of sequence space than raw UniProtKB.
 
 ## Splits
 
@@ -124,3 +122,20 @@ with shard.open("rb") as f, dctx.stream_reader(f) as reader:
 ## Preparation
 
 The normalization script used to create the Parquet files is included at `scripts/prepare_uniref50_dataset.py`.
+
+
+# Citation
+
+```
+@article{suzek2015uniref,
+  title     = {{UniRef} clusters: a comprehensive and scalable alternative for improving sequence similarity searches},
+  author    = {Suzek, Baris E. and Wang, Yuqi and Huang, Hongzhan and McGarvey, Peter B. and Wu, Cathy H. and {UniProt Consortium}},
+  journal   = {Bioinformatics},
+  volume    = {31},
+  number    = {6},
+  pages     = {926--932},
+  year      = {2015},
+  publisher = {Oxford University Press},
+  doi       = {10.1093/bioinformatics/btu739}
+}
+```