Checking file: http://genome.ucsc.edu/goldenPath/help/pbTracksHelpFiles/pbcCnt.shtml

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Link = Prediction of disulfide connectivity in proteins
URL = http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11673241&dopt=Abstract
          Response Code = 0
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Link = Role of evolutionary information in predicting the disulfide-bonding state of cysteine in proteins
URL = http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10409827&dopt=Abstract
          Response Code = 0
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Link = Predicting the disulfide bonding state of cysteines using protein descriptors
URL = http://www.ncbi.nlm.nih.gov:80/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11835499&dopt=Abstract
          Response Code = 0
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Count of links checked = 8
Count of error links   = 3