... interfaces within neuronal nAChR subunitcombinations (compare Fig. 2A C)4.Sofar ,a- conotoxinsselectively targeting mammalian a3 b2 (a- MII, a- GIC) a6 b2 (a- MII, a- PIA), a3 b4 (a- AuIB) and a7 (a- ImI) interfaceshave ... presumably a3 b2b4* and a6 /a3 b2b4* nAChRs in canine intracardiacganglia, rat medial habenula neurons and in locus coerulusneurons [75,76,79] (Fig. 2B). Interestingly, a (H1 2A) ana-logue of MII, ... nAChRs: a major population of a- BTX binding a7 * nAChRs whichis mainly localized perisynaptically, and a less abundantpopulation of a3 * nAChRs which contain a5 andb4subunits and in some cases b2 subunits,...