Establishment and characterization of a renal cell carcinoma cell line (FU-UR-1) with the reciprocal ASPL-TFE3 fusion transcript..     ///    "Reverse transcriptase-polymerase chain reaction (RT-PCR) and sequence analysis demonstrated reciprocal ASPL-TFE3 and TFE3-ASPL fusion transcripts in the retroperitoneal tumor, cultured FU-UR-1 cells and xenografted tumors. "    ///    This well-examined cell line may become a useful system for studying the genetic and biologic characteristics of rare neoplasms with the reciprocal ASPL-TFE3 fusion transcript.. 