GOLPH3 and neoplasm: Contrasting with NB, essentially no CTV coat protein or viral RNA was detected in N. occidentalis tumours in spite of the high GUS expression observed, suggesting limited virus replication if any in cells of this host, in agreement with the lack of CTV replication observed previously in protoplasts of this species (Navas-Castillo et al., 1997; Satyanarayana et al., 2000).