α-Conotoxin BuIA is a paralytic peptide neurotoxin that acts as a competitive antagonist of nicotinic acetylcholine receptors (nAChR), with inhibitory concentration 50 (IC50) values of 0.258 nM for α6/α3β2, 1.54 nM for α6/α3β4, and 5.72 nM for α3β2. It serves to differentiate between nAChRs containing the β2- and β4-subunits. Furthermore, α-Conotoxin BuIA selectively inhibits αxβ2 nAChRs, exhibiting a potency hierarchy of α6>α3>α2>α4 [1].