Update README.md

README.md

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 ### Data and annotations
 
 The dataset can be found here: https://huggingface.co/datasets/PDBEurope/protein_structure_NER_model_v2.1
+
+### Citation
+Vollmar, M., Tirunagari, S., Harrus, D. et al.
+Dataset from a human-in-the-loop approach to identify functionally important protein residues from literature.
+Sci Data 11, 1032
+2024
+https://doi.org/10.1038/s41597-024-03841-9