BRD4 and neuroblastoma: Given that the BET family is expressed ubiquitously, except for BRDT, which is only expressed in the testis (14), two MYCN- amplified NB cell lines [IMR-32 and SK-N-BE(2)] and two MYCN non-amplified NB cell lines (SK-N-SH and SH-SY5Y) were used to study the expression level of BRD2, BRD3, and BRD4.