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Endothelial cells in blood vessels are known to be important during the later stages of organ development in the embryo. However, their involvement at the induction stage of organ formation has not been previously documented. As Bahary and Zon explain in their Perspective, new work demonstrates that endothelial cells secrete factors early in development that induce embryonic endoderm to become liver or pancreas (Matsumoto et al., Lammert et al.). 相似文献
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Predacious mites fed for two generations solely on the eggs of wild-type spider mites responded normally to short day lengths by entering diapause. However, predacious mites fedfor two generations on eggs of albino spider mites, which are completely devoid of carotenoids, did not respond to short-day photoperiods. Apparently carotenoids are essential for photoperiodic induction; possibly a carotenoid or carotenoid derivative functions as the photopigment concerned in photoperiodic light reception in these mites. 相似文献
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Langenau DM Traver D Ferrando AA Kutok JL Aster JC Kanki JP Lin S Prochownik E Trede NS Zon LI Look AT 《Science (New York, N.Y.)》2003,299(5608):887-890
The zebrafish is an attractive model organism for studying cancer development because of its genetic accessibility. Here we describe the induction of clonally derived T cell acute lymphoblastic leukemia in transgenic zebrafish expressing mouse c-myc under control of the zebrafish Rag2 promoter. Visualization of leukemic cells expressing a chimeric transgene encoding Myc fused to green fluorescent protein (GFP) revealed that leukemias arose in the thymus, spread locally into gill arches and retro-orbital soft tissue, and then disseminated into skeletal muscle and abdominal organs. Leukemic cells homed back to the thymus in irradiated fish transplanted with GFP-labeled leukemic lymphoblasts. This transgenic model provides a platform for drug screens and for genetic screens aimed at identifying mutations that suppress or enhance c-myc- induced carcinogenesis. 相似文献
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邹铭之 《上海交通大学学报(农业科学版)》1988,(3)
作者测量和观察黄鼬的掌、跖垫、其肉垫的大小为雌黄鼬小于雄黄鼬、肉垫上有同型的斗形纹、其花纹的明显程度与肉垫大小有关,肉垫强的韧性和弹性来源于网状层中发达的胶原:弹性纤维,便于黄鼬捕捉鼠类。 相似文献
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Zon Aboubacar Oumar Kouassi Edouard Konan Ouédraogo Amadé 《Genetic Resources and Crop Evolution》2021,68(5):1731-1745
Genetic Resources and Crop Evolution - Palms constitute vital species for local people’s well-being, especially in West Africa. This analytic review aims at providing an overview of West... 相似文献