<|begin_of_text|><|start_header_id|>system<|end_header_id|>

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: data are available from the following sources: zachary karate club data (http://konect.uni-koblenz.de/networks/ucidata-zachary); globin protein sequence (ftp://selab.janelia.org/pub/software/hmmer/2.2g/); pairseqsim (http://www.bioconductor.org/packages/bioc/1.8/html/pairseqsim.html); ribosome map: our 3-d density maps of the two distinct ribosome states are provided by sjors h w scheres. requests to access this data can be made by contacting dr. scheres (scheres@mrc-lmb.cam.ac.uk). (http://www2.mrc-lmb.cam.ac.uk/groups/scheres/).<|eot_id|><|start_header_id|>assistant<|end_header_id|>

yes<|eot_id|>