1. Electronic code of federal regulations https://www.ecfr.gov/cgi-bin/text-idx?SID=979b6410bd4b4f8ed9415fbd210ae6de&mc=true&tpl=/ecfrbrowse/Title21/21cfr1271_main_02.tpl
2. Tissue Reference Group US Food and Drug Administration https://www.fda.gov/biologicsbloodvaccines/tissuetissueproducts/regulationoftissues/ucm152857.htm
3. What is FMT? The Fecal Transplant Foundation http://thefecaltransplantfoundation.org/what-is-fecal-transplant/
4. Guidance for Industry: Enforcement Policy Regarding Investigational New Drug Requirements for Use of Fecal Microbiota for Transplantation to Treat Clostridium difficile Infection Not Responsive to Standard Therapies https://www.fda.gov/downloads/BiologicsBloodVaccines/GuidanceComplianceRegulatoryInformation/Guidances/Vaccines/UCM387255.pdf