RAG1 and immune system disorder: In addition, we obtained dual gene knockout piglets [i.e., c9 (TYR-/-IL2RG-/-), d14 (TYR-/-RAG1-/-) and d15 (TYR-/-RAG1-/-)] had phenotypes of both albinism and immunodeficiency, whereas some chimeras (i.e., piglet c12 carrying the TYR and IL2RG mutations) had the albino phenotype but did not exhibit immunodeficiency (Table 3).