HTR3A and neuroblastoma: We cloned the short splice variant of the mouse 5-HT3-R (Hope et al. 1993), expressed the receptor protein in human embryonic kidney (HEK293) cells, and compared its pharmacological properties with those of the native mouse 5-HT3-R in N1E-115 neuroblastoma cells by means of 3H-GR65630 binding and 5-HT-induced 14C-guanidinium influx measurements (Brüss et al. 1999a).