The serotonin receptors 1A (5-HT1A), 2C (5-HT2C) and 3 (5-HT3) are expressed in the La and BL (Clemett et al. 2000; Miquel et al. 2002; Pazos and Palacios 1985) and seem to be crucially involved in the regulation of anxiety-related neuronal circuitries. Here, HTR1A is linked to Anxiety.