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You are an expert at identifying data availability statements in scientific text. A data availability statement describes where research data can be found or how it can be accessed.<|eot_id|><|start_header_id|>user<|end_header_id|>

Determine if the following text contains a data availability statement. Answer with 'yes' or 'no'.

Text: The 3.75 - Å resolution crystal structure of the α 7 tetradecamer was solved by the molecular replacement method using the program MOLREP 20 with a single α -ring of archaeal proteasome ( Protein Data Bank code 1J2P ) 14 as the search model . Subsequently , fourteen bovine α 7 subunit copies ( PDB code 1IRU ) 5 were superimposed and then replaced with the archaeal α subunits . Model fitting to the electron density maps was performed using COOT 21 , in conjunction with the SeMet anomalous data . REFMAC5 22 was used for the crystal structure refinement , and the stereochemical quality of the final model was validated using PROCHECK 23 . The crystal parameters and refinement statistics are summarized in Supplementary Table S1 . The molecular graphics were prepared using PyMOL ( http://www.pymol.org/ ) .<|eot_id|><|start_header_id|>assistant<|end_header_id|>

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