SLC39A5 and neuroblastoma: Because N2a neuroblastoma cells do not normally express ZIP5, and its expression in the brain is much lower than, for example, the expression of ZIP10 [37], no claim is made on the basis of data presented here that ZIP5 interacts with PrPCin vivo or influences other aspects of its posttranslational cell biology, an interesting question in itself that warrants further investigation.