ABOOD, S. The effects of exposed Black seed (Nigella sativa L.) callus by gamma rays on specific activity of dihydrofolate reductase and folate content Extracted from it. Journal of Education and Science, [S. l.], v. 21, n. 4, p. 34–44, 2008. DOI: 10.33899/edusj.2008.56086. Disponível em: https://edusj.uomosul.edu.iq/index.php/edusj/article/view/42400. Acesso em: 10 sep. 2025.