University of Michigan, Ann Arbor, MI 48109 USA
| 1. | Archaebacterial membrane (21 proteins) | |
| 2. | Bacterial gram-negative inner membrane (113 proteins) | |
| 3. | Bacterial gram-negative outer membrane (67 proteins) | |
| 4. | Bacterial gram-positive acid-fast cell wall (6 proteins) | |
| 5. | Bacterial gram-positive plasma membrane (15 proteins) | |
| 6. | Chloroplast inner membrane (0 proteins) | |
| 7. | Chloroplast outer membrane (0 proteins) | |
| 8. | Endoplasmic reticulum membrane (46 proteins) | |
| 9. | Endosome membrane (12 proteins) | |
| 10. | Eukaryotic plasma membrane (195 proteins) | |
| 11. | Golgi membrane (9 proteins) | |
| 12. | Lysosome membrane (10 proteins) | |
| 13. | Mitochondrial inner membrane (20 proteins) | |
| 14. | Mitochondrial outer membrane (12 proteins) | |
| 15. | Nuclear inner membrane (3 proteins) | |
| 16. | Nuclear outer membrane (4 proteins) | |
| 17. | Peroxisome membrane (2 proteins) | |
| 18. | Secreted (294 proteins) | |
| 19. | Thylakoid membrane (19 proteins) | |
| 20. | Vacuole membrane (5 proteins) | |
| 21. | Vesicle membrane (4 proteins) | |
| 22. | Viral membrane (11 proteins) |