| 501 (4202) | Helmholtz-Zentrum Hereon | DEU |  |
| 502 (4266) | Centre for Ecological Research | HUN | |
| 503 (4285) | Museo Nacional de Ciencias Naturales | ESP | |
| 504 (4349) | National Institute for Environmental Studies | JPN | |
| 505 (4359) | Belgian Nuclear Research Centre | BEL | |
| 506 (4378) | Forestry and Forest Products Research Institute | JPN | |
| 507 (4428) | Centro de Investigacion en Materiales Avanzados | MEX | |
| 508 (4444) | Centro de Investigacions Marinas | ESP | |
| 509 (4464) | Instituto Potosino de Investigacion Cientifica y Tecnologica | MEX | |
| 510 (4499) | Centre d'Etudes Biologiques de Chize | FRA | |
| 511 (4544) | Crop Research Institute | CZE | |
| 512 (4556) | Hyogo Cancer Center | JPN | |
| 513 (4562) | South Australian Research and Development Institute | AUS | |
| 514 (4605) | Instituto de Ecologia, A.C. | MEX | |
| 515 (4609) | Landcare Research | NZL | |
| 516 (4629) | United States Fish and Wildlife Service | USA | |
| 517 (4639) | Instituto Nacional de Investigaciones Forestales, Agricolas y Pecuarias | MEX | |
| 518 (4750) | Centro de Investigaciones Biologicas del Noroeste | MEX | |
| 519 (4846) | Centros Regionales CONICYT * | CHL | |
| 520 (4935) | Centre of Molecular and Macromolecular Studies Polish Academy of Sciences | POL | |
| 521 (5004) | Centro de Investigacion Cientifica de Yucatan | MEX | |
| 522 (5050) | Tecnologico Nacional de Mexico * | MEX | |
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