{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,16]],"date-time":"2026-06-16T16:06:00Z","timestamp":1781625960499,"version":"3.54.5"},"reference-count":0,"publisher":"Portland Press Ltd.","issue":"4","content-domain":{"domain":["portlandpress.com"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[1971,10,1]]},"abstract":"<jats:p>A single lipophosphoprotein complex, vitellogenin, was isolated and purified from the plasma of oestrogen-stimulated female toads by preparative ultracentrifugation and chromatography on TEAE-cellulose (triethylaminoethylcellulose). The protein contains 12% lipid, 1.5% phosphorus, 1.6% calcium and smaller amounts of carbohydrates and biliverdin. In amino acid composition it is identical with total yolk-platelet protein. The platelet protein, however, is fractionated on TEAE-cellulose into two components, a high-molecular-weight lipovitellin and a smaller phosvitin. Analyses of the soluble plasma vitellogenin suggest that it is a complex of two phosvitin molecules covalently bound to one lipovitellin dimer, and that it is the immediate precursor of the yolk proteins, into which it is converted by a molecular rearrangement. Uptake of vitellogenin from the plasma into the growing oocyte, and its subsequent crystallization as a yolk platelet, appear to be enhanced by gonadotrophic hormones.<\/jats:p>","DOI":"10.1042\/bj1240759","type":"journal-article","created":{"date-parts":[[2015,8,13]],"date-time":"2015-08-13T21:37:43Z","timestamp":1439501863000},"page":"759-766","update-policy":"https:\/\/doi.org\/10.1042\/crossmark_policy","source":"Crossref","is-referenced-by-count":93,"title":["The crystalline yolk-platelet proteins and their soluble plasma precursor in an amphibian, <i>Xenopus laevis<\/i>"],"prefix":"10.1042","volume":"124","author":[{"given":"M. R.","family":"Redshaw","sequence":"first","affiliation":[{"name":"Department of Zoology, University College of North Wales, Bangor, Caerns., U.K."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"B. K.","family":"Follett","sequence":"additional","affiliation":[{"name":"Department of Zoology, University College of North Wales, Bangor, Caerns., U.K."}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"288","container-title":["Biochemical Journal"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/portlandpress.com\/biochemj\/article-pdf\/124\/4\/759\/771947\/bj1240759.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"syndication"},{"URL":"https:\/\/portlandpress.com\/biochemj\/article-pdf\/124\/4\/759\/771947\/bj1240759.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2021,11,26]],"date-time":"2021-11-26T19:01:35Z","timestamp":1637953295000},"score":1,"resource":{"primary":{"URL":"https:\/\/portlandpress.com\/biochemj\/article\/124\/4\/759\/16853\/The-crystalline-yolk-platelet-proteins-and-their"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1971,10,1]]},"references-count":0,"journal-issue":{"issue":"4","published-print":{"date-parts":[[1971,10,1]]}},"URL":"https:\/\/doi.org\/10.1042\/bj1240759","relation":{},"ISSN":["0306-3283"],"issn-type":[{"value":"0306-3283","type":"print"}],"subject":[],"published":{"date-parts":[[1971,10,1]]}}}