update README.md

README.md

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 ## How to use the data sets
 
-This dataset contains more about 80,000 unique pairs of protein sequences and ligand SMILES, and the coordinates
+This dataset contains more about 60,000 unique pairs of protein sequences and ligand SMILES, and the coordinates
 of their complexes from the PDB. 
 
 SMILES are assumed to be tokenized by the regex from P. Schwaller.