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. 2022 Mar 31;16:861800. doi: 10.3389/fncir.2022.861800

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Copyright © 2022 Mori and Sakano.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Subsets of projection neurons for distinct behavioral decisions. External tufted cells (eTC) and middle tufted cells (mTC) serve as multi-synaptic channels to the amygdala for learned behavioral decisions. Mitral cells (MC) are direct channels to induce innate behavioral decisions. Internal tufted cells (iTC) and displaced mitral cells (dMC) may serve as direct channels for imprinted behavioral decisions. The diagram also illustrates distinct projection targets of MCs and TCs in each domain of the olfactory bulb (OB). Examples of domain-specific targets are shown for MCs and TCs in the lower boxes. Abbreviations: aiCAP, the most anterolateral isolation of the cap compartment of the olfactory tubercle (OT); aMeA, anterior region of the medial amygdala; AON, anterior olfactory nucleus; AONe, AON external part; AONm, AON medial part; AONp, AON posterior part; APC, anterior piriform cortex; ENTl, lateral entorhinal area; pmCoA, posteromedial cortical amygdala; PPC, posterior piriform cortex; TT, tenia tecta; Nrp2, Neuropilin 2; D, dorsal; and V, ventral.