TAC1 and neuroblastoma: A less targeted approach by this group reported two other NKA subunits, Atp1a1 and Atp1b3, in a list or approximately 50 candidate PrPC interactors in the N2a mouse neuroblastoma cell model [31, 32] before our recent PrPC interactome analyses documented co-immunoprecipitation of the NKA alpha-1 subunit with PrPC in three of four mouse cell models tested [9].