* Look at the Systems table. Is there a date in the Date field for all gene ID systems present in the database?
 
* Look at the Systems table. Is there a date in the Date field for all gene ID systems present in the database?
 +
** The Systems table does not have gene ID information. Instead, it has a column titled "System Name" that seems to refer to all of the systems this database could be associated with. It does not have dates next to all of the databases mentioned.
 
* Open the UniProt, RefSeq, and OrderedLocusNames tables. Scroll down through the table. Do all of the IDs look like they take the correct form for that type of ID?
 
* Open the UniProt, RefSeq, and OrderedLocusNames tables. Scroll down through the table. Do all of the IDs look like they take the correct form for that type of ID?
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Backtrace:
#0 /apps/xmlpipedb/biodb/fall2015/includes/diff/DairikiDiff.php(544): DiffEngine->diag()
#1 /apps/xmlpipedb/biodb/fall2015/includes/diff/DairikiDiff.php(344): DiffEngine->compareSeq()
#2 /apps/xmlpipedb/biodb/fall2015/includes/diff/DairikiDiff.php(227): DiffEngine->diffLocal()
#3 /apps/xmlpipedb/biodb/fall2015/includes/diff/DairikiDiff.php(721): DiffEngine->diff()
#4 /apps/xmlpipedb/biodb/fall2015/includes/diff/DairikiDiff.php(859): Diff->__construct()
#5 /apps/xmlpipedb/biodb/fall2015/includes/diff/DairikiDiff.php(980): MappedDiff->__construct()
#6 /apps/xmlpipedb/biodb/fall2015/includes/diff/TableDiffFormatter.php(194): WordLevelDiff->__construct()
#7 /apps/xmlpipedb/biodb/fall2015/includes/diff/DiffFormatter.php(140): TableDiffFormatter->changed()
#8 /apps/xmlpipedb/biodb/fall2015/includes/diff/DiffFormatter.php(82): DiffFormatter->block()
#9 /apps/xmlpipedb/biodb/fall2015/includes/diff/DifferenceEngine.php(888): DiffFormatter->format()
#10 /apps/xmlpipedb/biodb/fall2015/includes/diff/DifferenceEngine.php(802): DifferenceEngine->generateTextDiffBody()
#11 /apps/xmlpipedb/biodb/fall2015/includes/diff/DifferenceEngine.php(733): DifferenceEngine->generateContentDiffBody()
#12 /apps/xmlpipedb/biodb/fall2015/includes/diff/DifferenceEngine.php(662): DifferenceEngine->getDiffBody()
#13 /apps/xmlpipedb/biodb/fall2015/includes/diff/DifferenceEngine.php(632): DifferenceEngine->getDiff()
#14 /apps/xmlpipedb/biodb/fall2015/includes/diff/DifferenceEngine.php(453): DifferenceEngine->showDiff()
#15 /apps/xmlpipedb/biodb/fall2015/includes/page/Article.php(795): DifferenceEngine->showDiffPage()
#16 /apps/xmlpipedb/biodb/fall2015/includes/page/Article.php(506): Article->showDiffPage()
#17 /apps/xmlpipedb/biodb/fall2015/includes/actions/ViewAction.php(44): Article->view()
#18 /apps/xmlpipedb/biodb/fall2015/includes/MediaWiki.php(395): ViewAction->show()
#19 /apps/xmlpipedb/biodb/fall2015/includes/MediaWiki.php(273): MediaWiki->performAction()
#20 /apps/xmlpipedb/biodb/fall2015/includes/MediaWiki.php(566): MediaWiki->performRequest()
#21 /apps/xmlpipedb/biodb/fall2015/includes/MediaWiki.php(414): MediaWiki->main()
#22 /apps/xmlpipedb/biodb/fall2015/index.php(44): MediaWiki->run()
#23 {main}