| # | Title | Name | Town/City | S/C/P | Region | Comment | Date |
|---|---|---|---|---|---|---|---|
| 551 | N/G | Asif ud-Doula | N/G | PA | USA | N/G | Oct 20, 2011 |
| 552 | Dr. | Ana María Orsatti | Buenos Aires | N/G | Argentina | N/G | Oct 20, 2011 |
| 553 | N/G | Anonymous | N/G | N/G | Argentina | N/G | Oct 20, 2011 |
| 554 | Dr | Manfred Pakull | Strasbourg | N/G | France | N/G | Oct 20, 2011 |
| 555 | Dr. | Otmar Stahl | N/G | N/G | N/G | N/G | Oct 20, 2011 |
| 556 | Mr | Federico Bareilles | La Plata | Buenos Aires | Argentina | N/G | Oct 20, 2011 |
| 557 | Dr | Athanassios Vassilopoulos | N/G | N/G | N/G | N/G | Oct 20, 2011 |
| 558 | N/G | Derck Massa | Baltimore | MD | USA | N/G | Oct 20, 2011 |
| 559 | Dr | Luis Alberto Aguilar | N/G | Mexico | Mayotte | N/G | Oct 20, 2011 |
| 560 | Dr. | Roberta Humphreys | University of Minnesota | Minnesota | USA | N/G | Oct 20, 2011 |
| 561 | Prof | Robert Gehrz | N/G | N/G | N/G | N/G | Oct 20, 2011 |
| 562 | Dr | Catherine Vlahakis | N/G | N/G | Chile | N/G | Oct 20, 2011 |
| 563 | Mr | Federico Giudici | N/G | N/G | Argentina | N/G | Oct 20, 2011 |
| 564 | Dr | Edmundo Marcelo Arnal | N/G | N/G | Argentina | View | Oct 20, 2011 |
| 565 | Mr | Nikolas Portarakis | N/G | N/G | France | N/G | Oct 20, 2011 |
| 566 | Dr | Hugues Sana | N/G | N/G | Netherlands | N/G | Oct 20, 2011 |
| 567 | Mr | Carlos ROmero | Highland Park | New Jersey | USA | N/G | Oct 20, 2011 |
| 568 | Dr | Luis Benet | N/G | N/G | Mexico | N/G | Oct 20, 2011 |
| 569 | Prof | Lex Kaper | Amsterdam | The Netherlands | Netherlands | N/G | Oct 20, 2011 |
| 570 | Dr. | Gladys Cassab | Cuernavaca | Morelos | Mexico | N/G | Oct 20, 2011 |
| 571 | Dr | Philip Massey | N/G | N/G | USA | N/G | Oct 20, 2011 |
| 572 | Ms | Ivon Witteveen | La Plata | Buenos Aires | Argentina | N/G | Oct 20, 2011 |
| 573 | Dr | Eduardo Fernández Lajús | La Plata | Buenos Aires | Argentina | N/G | Oct 20, 2011 |
| 574 | Dr | Claudia Scoccola | N/G | N/G | N/G | N/G | Oct 20, 2011 |
| 575 | Miss | Rocio Isabel Paez | N/G | N/G | Argentina | N/G | Oct 20, 2011 |
| 576 | Prof | Juan Carlos Muzzio | La Plata | Pcia. de Buenos Aires | Argentina | N/G | Oct 20, 2011 |
| 577 | Dr | Jose Prieto | Princeton | N/G | USA | N/G | Oct 20, 2011 |
| 578 | Dr. | Anonymous | N/G | N/G | USA | N/G | Oct 20, 2011 |
| 579 | Ms | Emeline Bolmont | N/G | N/G | N/G | N/G | Oct 20, 2011 |
| 580 | N/G | IOANNA LEONIDAKI | N/G | N/G | N/G | N/G | Oct 20, 2011 |
| 581 | Dr | Roberto Vazquez | Ensenada | N/G | Mayotte | N/G | Oct 20, 2011 |
| 582 | Prof | deborah dultzin | N/G | N/G | Mexico | N/G | Oct 20, 2011 |
| 583 | Dr | Joanna Thomas-Osip | N/G | N/G | Chile | N/G | Oct 20, 2011 |
| 584 | Prof. Dr. | Rolf-Peter Kudritzki | Honolulu | Hawaii | USA | N/G | Oct 20, 2011 |
| 585 | Mr | Christopher Kiehn | N/G | N/G | N/G | N/G | Oct 20, 2011 |
| 586 | Dr | Benedict Ritchie | N/G | N/G | UK | N/G | Oct 20, 2011 |
| 587 | N/G | Joaquín Bohigas Bosch | N/G | N/G | Mexico | N/G | Oct 20, 2011 |
| 588 | N/G | Jorge Perez | N/G | N/G | N/G | N/G | Oct 20, 2011 |
| 589 | Dr | Brandi Estela | La Plata | Prov. Buenos Aires | Argentina | N/G | Oct 20, 2011 |
| 590 | Dr. | Pablo Cincotta | La Plata | N/G | Argentina | N/G | Oct 20, 2011 |
| 591 | Dr. | Joel Parker | N/G | N/G | N/G | N/G | Oct 20, 2011 |
| 592 | Dr | Josefa Masegosa | N/G | N/G | Spain | View | Oct 20, 2011 |
| 593 | Dr | Erasmo Buonomo | N/G | N/G | N/G | N/G | Oct 20, 2011 |
| 594 | Dr. | Carsten Kramer | Granada | N/G | Spain | N/G | Oct 20, 2011 |
| 595 | Dr | Damien Hutsemékers | N/G | N/G | Belgium | N/G | Oct 20, 2011 |
| 596 | N/G | Antonio Sarmiento G | Cuernavaca | Morelos | Mexico | N/G | Oct 20, 2011 |
| 597 | Dr | Georgina Ponce Romero | Cuernavaca | Morelos, México | Mexico | N/G | Oct 20, 2011 |
| 598 | Dr | Verónica Firpo | N/G | N/G | N/G | N/G | Oct 20, 2011 |
| 599 | N/G | GEORGE PAVLIDIS | N/G | N/G | N/G | View | Oct 20, 2011 |
| 600 | Dr | Amokrane Berdja | N/G | N/G | N/G | N/G | Oct 20, 2011 |
- S/C/P - State, County or Province
- Dates displayed in the signature list are based on UTC/GMT
- Anonymous signatures signify people who have chosen not to display their names publicly
- A comment in gray indicates that the signer has hidden their comment from public view