User management was totally rewritten in JIRA 4.3
You can see the table names that have changed here - http://confluence.atlassian.com/display/JIRA044/JIRA+4.3+Upgrade+Guide#JIRA43UpgradeGuide-Databasetableshavechanged
Basically they are using an embedded version of their Crowd server now, inside of JIRA
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