CHRNA4 and neuroblastoma: In contrast to Az, at concentration up to 100 μM (Figure 2f) manifesting no activity against human neuronal heteromeric α3-containing nAChRs (α3β2, α3β4, etc.)expressed in neuroblastoma SH-SY5Y cells, rocuronium dose-dependently inhibited these nAChR subtypes (Figure 3c).