| Http://: http://ilarjournal.oxfordjournals.org/content/37/1/16.full.pdf+html |
| Http://: http://www.fda.gov/BiologicsBloodVaccines/Xenotransplantation/ |
| Http://: http://ilarjournal.oxfordjournals.org/content/37/1/16.full.pdf+html |
| Http://: http://www.fda.gov/BiologicsBloodVaccines/Xenotransplantation/ |