genome xt9_1 trackDb xt9_1/trackDb.txt groups xt9_1/groups.txt description Jul. 2016 Xenopus tropicalis v9.1 (XenBase) twoBitPath xt9_1/Xenopus_tropicalis_v9.2bit organism Xenopus tropicalis defaultPos Chr01:0-194866763 orderKey 4700 scientificName Xenopus tropicalis htmlPath xt9_1/description.html