Weber, Tilo, Frigga Wirths, Nina Brakebusch, and Jan van der Valk. “Reply to Comment ‘Animal Welfare and Ethics in the Collection of Fetal Blood for the Production of Fetal Bovine serum’”. ALTEX - Alternatives to animal experimentation 38, no. 2 (April 20, 2021): 324–326. Accessed December 3, 2022. https://www.altex.org/index.php/altex/article/view/2278.