| Rank | Referring Site | Accesses | % | Bytes | % |
|---|---|---|---|---|---|
| 1 | http://www.google.com | 4,306 | 18.99 | 198,728,533 | 18.49 |
| 2 | http://images.google.com | 1,372 | 6.05 | 137,788,240 | 12.82 |
| 3 | http://search.yahoo.com | 1,158 | 5.11 | 48,255,822 | 4.49 |
| 4 | http://cmgm.stanford.edu:80 | 1,022 | 4.51 | 14,966 | 0.00 |
| 5 | http://www.stanford.edu | 662 | 2.92 | 3,774,031 | 0.35 |
| 6 | http://search.msn.com | 598 | 2.64 | 6,353,468 | 0.59 |
| 7 | http://find.stanford.edu | 580 | 2.56 | 76,309,900 | 7.10 |
| 8 | http://www.google.ca | 545 | 2.40 | 28,375,450 | 2.64 |
| 9 | http://steinmanlab.stanford.edu | 487 | 2.15 | 4,197,826 | 0.39 |
| 10 | http://falkow.stanford.edu | 427 | 1.88 | 292,065 | 0.03 |
| 11 | http://zebrafish.stanford.edu | 374 | 1.65 | 388,459 | 0.04 |
| 12 | http://images.google.ca | 317 | 1.40 | 44,232,370 | 4.12 |
| 13 | http://www.bio.davidson.edu | 314 | 1.38 | 809,866 | 0.08 |
| 14 | http://www.google.de | 307 | 1.35 | 13,494,185 | 1.26 |
| 15 | http://brownlab.stanford.edu | 252 | 1.11 | 23,401,130 | 2.18 |
| 16 | http://www.google.co.in | 236 | 1.04 | 4,663,365 | 0.43 |
| 17 | http://www.altavista.com | 216 | 0.95 | 12,590,621 | 1.17 |
| 18 | http://171.65.22.158 | 216 | 0.95 | 40,156,096 | 3.74 |
| 19 | http://216.239.37.104 | 196 | 0.86 | 1,414,574 | 0.13 |
| 20 | http://www.google.co.uk | 192 | 0.85 | 5,365,754 | 0.50 |
| 21 | http://images.search.yahoo.com | 187 | 0.82 | 18,848,370 | 1.75 |
| 22 | http://www.google.fr | 169 | 0.75 | 6,497,030 | 0.60 |
| 23 | http://pmgm2.stanford.edu | 168 | 0.74 | 118,954 | 0.01 |
| 24 | http://www.protocol-online.org | 167 | 0.74 | 1,390,806 | 0.13 |
| 25 | http://www-med.stanford.edu | 162 | 0.71 | 670,384 | 0.06 |