Where do med schools get their funding since tuition isn't enough?

What sources do medical schools derive their revenue from?
Medical schools have several sources that contribute to their overall revenue stream. For example, below is a table and chart illustrating the breakdown of medical school revenues in 2001-2002.(6)

Revenue Source 2001-2002 Percentage (All Schools)
Practice Plans 36.0
Hospitals/Medical School Programs 12.5
Federal Appropriations 0.3
State and Local Government Appropriations 7.1
Parent University Support 0.6
Tuition and Fees 3.3 <<<<<============== wow! 3.3% Is that all? yikes!
Endowment 2.1
Gifts 2.4
Miscellaneous Sources 4.1
Total Grants and Contracts 31.7
Total Revenues 100.0