Update README.md

README.md

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----
-license: cc-by-4.0
-configs:
-- config_name: "cullpdb_pc95.0_res0.0-5.0_noBrks_len40-10000_R1.0_Xray+Nmr+EM_d2026_01_26_chains62732"
-  data_files: "curated_csv/subsets/cullpdb_pc95.0_res0.0-5.0_noBrks_len40-10000_R1.0_Xray+Nmr+EM_d2026_01_26_chains62732.csv"
----
-# PISCES-CulledPDB
-
-Curated protein chain tables from PISCES/CullPDB: one row per chain with sequence and metadata.
-
-**Dataset:** [PRMegathon26/PISCES-CulledPDB](https://huggingface.co/datasets/PRMegathon26/PISCES-CulledPDB)
-
-Use the **subset dropdown** in the viewer to switch between the main table and 242 curation subsets.
-
-## Summary
-
-| Item | Description |
-|------|-------------|
-| **Main CSV** | `curated_csv/cullpdb_compiled.csv` — 4,540,884 chains |
-| **Subsets** | `curated_csv/subsets/*.csv` — 242 files (same columns) |
-| **Index** | `curated_csv/cullpdb_list_fasta_index.csv` — 242 rows |
-
-Full list of subset paths: `curated_csv/dataset_metadata.json` (keys `data_paths`, `subset_paths`).
-
-## Columns (chain CSVs)
-
-| Column | Description |
-|--------|-------------|
-| **pdb_chain** | PDB chain ID (e.g. 1ABC_A) |
-| **pdb** | PDB ID (first 4 chars) |
-| **chain** | Chain ID |
-| **sequence** | Amino acid sequence (one-letter) |
-| **len** | Sequence length |
-| **method** | Experimental method (e.g. XRAY, NMR) |
-| **resolution** | Resolution in Å (per structure) |
-| **rfac** | R-factor |
-| **freerfac** | Free R-factor |
-| **pc** | Sequence identity cutoff % used for this subset |
-| **no_breaks** | Whether chain has no breaks (yes/no) |
-| **R** | R-factor cutoff used for this subset |
-| **source_list** | Subset list basename (identifies curation parameters) |
-
-## Index CSV columns
-
-| Column | Description |
-|--------|-------------|
-| **list_basename** | Subset list basename |
-| **fasta_basename** | Corresponding FASTA basename |
-| **list_path** | Full path to list file |
-| **fasta_path** | Full path to FASTA file |
-| **n_chains** | Number of chains in this subset |
-| **pc** | Sequence identity cutoff % |
-| **resolution** | Resolution range (e.g. 0.0-2.0) |
-| **no_breaks** | yes/no |
-| **R** | R-factor cutoff |
-| **Nmethods** | Experiment types (e.g. Xray, Xray+EM) |
-
-## Usage
-
-### Python
-
-```python
-from huggingface_hub import hf_hub_download
-import pandas as pd
-
-path = hf_hub_download(repo_id="PRMegathon26/PISCES-CulledPDB", filename="curated_csv/cullpdb_compiled.csv", repo_type="dataset")
-df = pd.read_csv(path)
-```
-
-### Filter (filter_chains_csv.py)
-
-From repo root after clone/download:
-
-```bash
-python src/filter_chains_csv.py --input curated_csv/cullpdb_compiled.csv --output my_filtered.csv --pc 20 --resolution-max 2.0 --no-breaks yes --R 0.25
-```
-
-Options: `--pc`, `--pc-min`, `--pc-max`, `--resolution-min`, `--resolution-max`, `--no-breaks`, `--R`, `--method`, `--len-min`, `--len-max`.
-
-## License
-
-cc-by-4.0