Interacts selectively with the G-coupled somatostatin sst3 receptor (SSTR3). It displays antagonist property for SSTR3 (Ki=1.5 uM). Other somatostatin receptors are also affected, but with a lower selectivity: SSTR5 (Ki=80.2 uM), SSTR1 (Ki=169 uM), SSTR2 (KI=159 uM), SSTR4 (Ki>100 uM). Expressed by the venom duct. The cysteine framework is V (CC-CC). Contains 2 disulfide bonds that can be either 'C1-C3, C2-C4' or 'C1-C4, C2-C3', since these disulfide connectivities have been observed for conotoxins with cysteine framework V (for examples, see AC P0DQQ7 and AC P81755). 5-10 uM of the toxin does not have activity on 30 different class A receptors of GPCR, voltage-gated sodium channels (Nav1.2, 1.3, 1.4, 1.5, 1.6, 1.8 and the insect channel BgNaV1), voltage-gated potassium channels (Kv1.1, 1.2, 1.3, 1.4 1.5, 1.6, Kv2.1, hERG and the insect channel Shaker IR), muscular and neuronal nicotinic acetylcholine receptors (4 subtypes) and neurotransmitter transporters (3 subfamilies). Belongs to the conotoxin T superfamily. Due to the lack of the signal sequence, the classification of this peptide as a T-superfamily member is not definitively established. According to established conopeptide and toxin nomenclature, Greek letters are used to indicate pharmacological targets of toxins. The Greek letter 'tau' has already been attributed to toxins that target transient receptor potential (TRP) channels which is why it is indicated here only as an alternative name (PubMed:18619481).