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We hypothesized that conceptus must produce a molecule(s), yet uncharacterized or overlooked, which maintain conceptus adhesion to the uterine epithelium. In this study, we aimed to identify new candidate(s) in conceptus secretory proteins responsible for maintaining conceptus adhesion in sheep. We performed RNA-sequence analysis with ovine conceptuses, followed by endometria obtained from pregnant animals on day 15 (P15: pre-attachment), 17 (P17: right after attachment), and 21 (P21: post-attachment; adhesion) and iTRAQ analysis of uterine flushing on P15 and P17. To identify the proteins secreted from conceptuses, we cross-referenced the transcriptome and proteome data. These analyses identified 16 and 26 proteins as conceptus secretory proteins on P15 and P17, respectively. Gene ontology analysis revealed that the conceptus secretory proteins were enriched in those categorized to fibrinolysis and coagulation. RT-qPCR analysis verified that the expression levels of transcripts in conceptuses encoding coagulation factors, fibrinogen subunits, and fibrinolysis factors were significantly higher on P21 than on P15 or P17, which were supported by those through in situ hybridization, Western blotting and immunohistochemistry. Histology analysis confirmed that fibrin protein was present at the conceptus adhesion region on P21. These results suggest that in addition to the numerous adhesion molecules so far characterized, fibrin is a new candidate molecule for maintaining conceptus adhesion for pregnancy continuation in ruminants.<\/jats:p>","DOI":"10.1530\/rep-20-0531","type":"journal-article","created":{"date-parts":[[2021,4,14]],"date-time":"2021-04-14T16:44:03Z","timestamp":1618418643000},"page":"709-720","update-policy":"https:\/\/doi.org\/10.1530\/crossmarkpolicy-11","source":"Crossref","is-referenced-by-count":7,"title":["Formation of fibrin at sites of conceptus adhesion in the ewe"],"prefix":"10.1093","volume":"161","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9927-1756","authenticated-orcid":false,"given":"Yuta","family":"Matsuno","sequence":"first","affiliation":[{"name":"Laboratory of Molecular Reproduction , Research Institute of Agriculture, Tokai University, Kumamoto, Kumamoto, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yahia A","family":"Amin","sequence":"additional","affiliation":[{"name":"Department of Theriogenology , Faculty of Veterinary Medicine, Aswan University, Aswan, Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kazuya","family":"Kusama","sequence":"additional","affiliation":[{"name":"Department of Endocrine Pharmacology , Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kazuhiko","family":"Imakawa","sequence":"additional","affiliation":[{"name":"Laboratory of Molecular Reproduction , Research Institute of Agriculture, Tokai University, Kumamoto, Kumamoto, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"286","published-online":{"date-parts":[[2021,5,10]]},"reference":[{"key":"2026010712055582600_bib1","first-page":"181","article-title":"Integrins in cell adhesion and signaling","volume":"9","author":"Akiyama","year":"1996","journal-title":"Human Cell"},{"key":"2026010712055582600_bib2","doi-asserted-by":"crossref","first-page":"197","DOI":"10.1016\/S0031-6997(24)01359-0","article-title":"Signal transduction and signal modulation by cell adhesion receptors: the role of integrins, cadherins, immunoglobulin-cell adhesion molecules, and selectins","volume":"50","author":"Aplin","year":"1998","journal-title":"Pharmacological Reviews"},{"key":"2026010712055582600_bib3","doi-asserted-by":"publisher","first-page":"260","DOI":"10.1016\/j.ydbio.2005.02.009","article-title":"Blastocysts don\u2019t go it alone. 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