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We studied the topological position of the chicken LSO relative to molecular borders defined previously within the telencephalic subpallium (Puelles et al. [2000] J. Comp. Neurol. 424:409\u2013438). Differential expression of <jats:italic>Dlx5<\/jats:italic> and <jats:italic>Nkx2.1<\/jats:italic> homeobox genes, or the <jats:italic>Shh<\/jats:italic> gene encoding a secreted morphogen, allows distinction of striatal, pallidal, and preoptic subpallial sectors. The chicken LSO complex was characterized chemoarchitectonically from embryonic to posthatching stages, by using immunohistochemistry for calbindin, tyrosine hydroxylase, NKX2.1, and BEN proteins and in situ hybridization for <jats:italic>Nkx2.1<\/jats:italic>, <jats:italic>Nkx2.2<\/jats:italic>, <jats:italic>Nkx6.1<\/jats:italic>, <jats:italic>Shh<\/jats:italic>, and <jats:italic>Dlx5<\/jats:italic> mRNA. Medial and lateral parts of LSO appear, respectively, at the striatal part of the septum and adjacent bottom of the lateral ventricle (accumbens), in lateral continuity with another circumventricular organ that forms along a thin subregion of the entire striatum, abutting the molecular striatopallidal boundary; we called this the \u201cstriatopallidal organ\u201d (SPO). The SPO displays associated distal periventricular cells, which are lacking in the LSO. Moreover, the SPO is continuous caudomedially with a thin, linear ependymal specialization found around the extended amygdala and preoptic areas. This differs from SPO and LSO in some molecular aspects. We tentatively identified this structure as being composed of an \u201cextended amygdala organ\u201d (EAO) and a \u201cpreoptohypothalamic organ\u201d (PHO). The position of LSO, SPO, EAO, and PHO within a linear <jats:italic>Dlx5<\/jats:italic>\u2010expressing ventricular domain that surrounds the <jats:italic>Nkx2.1<\/jats:italic>\u2010expressing pallidopreoptic domain provides an unexpected insight into possible common and differential causal mechanisms underlying their formation. J. Comp. Neurol. 499:745\u2013767, 2006. \u00a9 2006 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/cne.21121","type":"journal-article","created":{"date-parts":[[2006,10,17]],"date-time":"2006-10-17T19:12:55Z","timestamp":1161112375000},"page":"745-767","source":"Crossref","is-referenced-by-count":26,"title":["Chicken lateral septal organ and other circumventricular organs form in a striatal subdomain abutting the molecular striatopallidal 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