RXFP3 and Anxiety: Receptor expression profiles suggest that RXFP3 is a brain neuropeptide receptor and RXFP4 a gut hormone receptor with the relaxin‐3/RXFP3 system modulating feeding [596, 597, 749, 1777, 1830], anxiety [1694, 2204], and reward and motivated goal‐directed behaviours [821, 1694, 2055].