RAG2 and nonpapillary renal cell carcinoma: MDA‐RCC‐48 (BALB/c nude),[30] 1∼13 (RAG2−/− γC−/−),[31] RP‐R‐02 (SCID),[32] 1−94 (NOD‐SCID),[33] ccRCC (NSG)[34]