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Histological and immunohistochemical appearances of extremely unfavorable histology and unfavorable histology neuroblastomas. ALT, alternative lengthening of telomere; ATRX, α-thalassemia/mental retardation syndrome X linked; EUH, extremely unfavorable histology; NB, neuroblastoma; TERT, telomerase reverse transcriptase; UH, unfavorable histology.
