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Extending this understanding requires knowledge of the molecular and structural organization of the olfactory system. Odor sensing begins with olfactory receptor neurons (ORNs), which express odorant receptors (ORs). In insects, ORNs are housed, in varying numbers, in olfactory sensilla. Because the organization of ORs within sensilla affects their function, it is essential to identify the ORs they contain. Here, using RNA sequencing, we identified 179 putative ORs in the transcriptomes of the two main olfactory organs, antenna and palp, of the locust <jats:italic>Schistocerca americana<\/jats:italic>. Quantitative expression analysis showed most putative ORs (140) are expressed in antennae while only 31 are in the palps. Further, our analysis identified one OR detected only in the palps and seven ORs that are expressed differentially by sex. An in situ analysis of OR expression suggested ORs are organized in non-random combinations within antennal sensilla. A phylogenetic comparison of OR predicted protein sequences revealed homologous relationships among two other <jats:italic>Acrididae<\/jats:italic> species. Our results provide a foundation for understanding the organization of the first stage of the olfactory system in <jats:italic>S. americana<\/jats:italic>, a well-studied model for olfactory processing.<\/jats:p>","DOI":"10.1038\/s41598-022-27199-3","type":"journal-article","created":{"date-parts":[[2022,12,31]],"date-time":"2022-12-31T11:02:47Z","timestamp":1672484567000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Identification and analysis of odorant receptors expressed in the two main olfactory organs, antennae and palps, of Schistocerca americana"],"prefix":"10.1038","volume":"12","author":[{"given":"Alejandra","family":"Boronat-Garcia","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"James","family":"Iben","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eunice","family":"Dominguez-Martin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mark","family":"Stopfer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2022,12,31]]},"reference":[{"issue":"3","key":"27199_CR1","doi-asserted-by":"publisher","first-page":"211","DOI":"10.1046\/j.1365-3032.2000.00176.x","volume":"25","author":"J Murlis","year":"2000","unstructured":"Murlis, J., Willis, M. 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