Azofeifa, Jorge, Meinhard Hahn, Edward Ruiz, Lars Hummerich, Ana I Morales, Gerardo Jiménez, and Ramiro Barrantes. 2004. “The STR Polymorphism (AAAAT)n Within the Intron 1 of the Tumor Protein 53 (TP53) Locus in 17 Populations of Different Ethnic Groups of Africa, America, Asia and Europe”. Revista De Biología Tropical 52 (3):645–657. https://revistas.ucr.ac.cr/index.php/rbt/article/view/15352.