{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,25]],"date-time":"2026-07-25T17:27:47Z","timestamp":1785000467348,"version":"3.55.0"},"reference-count":68,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2010,1,25]],"date-time":"2010-01-25T00:00:00Z","timestamp":1264377600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Journal of Morphology"],"published-print":{"date-parts":[[2010,6]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>We studied the ultrastructural organization of the ovarian follicles in a placentotrophic Andean lizard of the genus <jats:italic>Mabuya<\/jats:italic>. The oocyte of the primary follicle is surrounded by a single layer of follicle cells. During the previtellogenic stages, these cells become stratified and differentiated in three cell types: small, intermediate, and large globoid, non pyriform cells. Fluid\u2010filled spaces arise among follicular cells in late previtellogenic follicles and provide evidence of cell lysis. In vitellogenic follicles, the follicular cells constitute a monolayered granulosa with large lacunar spaces; the content of their cytoplasm is released to the perivitelline space where the zona pellucida is formed. The oolemma of younger oocytes presents incipient short projections; as the oocyte grows, these projections become organized in a microvillar surface. During vitellogenesis, cannaliculi develop from the base of the microvilli and internalize materials by endocytosis. In the juxtanuclear ooplasm of early previtellogenic follicles, the Balbiani's vitelline body is found as an aggregate of organelles and lipid droplets; this complex of organelles disperses in the ooplasm during oocyte growth. In late previtellogenesis, membranous organelles are especially abundant in the peripheral ooplasm, whereas abundant vesicles and granular material occur in the medullar ooplasm. The ooplasm of vitellogenic follicles shows a peripheral band constituted by abundant membranous organelles and numerous vesicular bodies, some of them with a small lipoprotein core. No organized yolk platelets, like in lecithotrophic reptiles, were observed. Toward the medullary ooplasm, electron\u2010lucent vesicles become larger in size containing remains of cytoplasmic material in dissolution. The results of this study demonstrate structural similarities between the follicles of this species and other Squamata; however, the ooplasm of the mature oocyte of <jats:italic>Mabuya<\/jats:italic> is morphologically similar to the ooplasm of mature oocytes of marsupials, suggesting an interesting evolutionary convergence related to the evolution of placentotrophy and of microlecithal eggs. J. Morphol., 2010. \u00a9 2010 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/jmor.10830","type":"journal-article","created":{"date-parts":[[2010,1,25]],"date-time":"2010-01-25T19:48:48Z","timestamp":1264448928000},"page":"738-749","source":"Crossref","is-referenced-by-count":25,"title":["Ultrastructure of the ovarian follicles in the placentotrophic Andean lizard of the genus <i>Mabuya<\/i> (Squamata: Scincidae)"],"prefix":"10.1002","volume":"271","author":[{"given":"Sim\u00f3n","family":"Vieira","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gloria Romero","family":"de P\u00e9rez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martha Patricia","family":"Ram\u00edrez\u2010Pinilla","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2010,1,25]]},"reference":[{"key":"e_1_2_1_2_1","volume-title":"Molecular biology of the cell","author":"Alberts B","year":"2002"},{"key":"e_1_2_1_3_1","first-page":"12","article-title":"Ovarian structure and follicle development in the lizard Mabuya brevicolis","volume":"5","author":"Al\u2010Dokhi O","year":"1998","journal-title":"Saudi J Bio Sci"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1002\/jmor.1052120102"},{"key":"e_1_2_1_5_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1440-169X.1987.00113.x"},{"key":"e_1_2_1_6_1","doi-asserted-by":"crossref","first-page":"341","DOI":"10.1242\/jcs.33.1.341","article-title":"Intercellular bridges between follicle cells and oocyte during the differentiation of follicular epithelium in Lacerta sicula","volume":"33","author":"Andreuccetti P","year":"1978","journal-title":"J Cell Sci"},{"key":"e_1_2_1_7_1","doi-asserted-by":"publisher","DOI":"10.1002\/ar.1070"},{"key":"e_1_2_1_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/jmor.1051130210"},{"key":"e_1_2_1_9_1","doi-asserted-by":"publisher","DOI":"10.1002\/jmor.10005"},{"key":"e_1_2_1_10_1","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pbio.0060063"},{"key":"e_1_2_1_11_1","doi-asserted-by":"publisher","DOI":"10.1071\/RD9960617"},{"key":"e_1_2_1_12_1","doi-asserted-by":"publisher","DOI":"10.1083\/jcb.12.3.623"},{"key":"e_1_2_1_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0940-9602(04)80113-4"},{"key":"e_1_2_1_14_1","series-title":"Fundamentals of Comparative Vertebrate Endocrinology","first-page":"257","author":"Callard IP","year":"1987"},{"key":"e_1_2_1_15_1","first-page":"207","article-title":"Strutture dell' ovario adulto di Chalcides ocellatus tiligugu (Gmelin) durante il corso dell'anno","volume":"83","author":"Corso G","year":"1978","journal-title":"Arch Ital Anat Embriol"},{"key":"e_1_2_1_16_1","first-page":"263","article-title":"Aspetti morfologici del follicolo ovarico previtellogenetico dello Scincide viviparo Chalcides ocellatus tiligugu (Gmelin) (Squamata. 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