1. https://www.chop.edu/centers-programs/vaccine-education-center/vaccine-ingredients/fetal-tissues
2. https://www.spectrumnews.org/news/trumps-fetal-tissue-policy-impacts-medical-research/
3. https://grants.nih.gov/grants/guide/notice-files/NOT-OD-19-128.html
4. https://abcnews.go.com/Health/wireStory/trump-ending-fetal-tissue-research-federal-scientists-63506968
5. https://www.sciencemag.org/news/2020/08/new-us-ethics-board-rejects-most-human-fetal-tissue-research-proposals