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29 March 2024
 
  » pubmed » pmid16778054

 Article overview


Phosphatized polar lobe-forming embryos from the Precambrian of southwest China
Jun-Yuan Chen ; David J Bottjer ; Eric H Davidson ; Stephen Q Dornbos ; Xiang Gao ; Yong-Hua Yang ; Chia-Wei Li ; Gang Li ; Xiu-Qiang Wang ; Ding-Chang Xian ; Hung-Jen Wu ; Yeu-Kuang Hwu ; Paul Tafforeau ;
Date 16 Jun 2006
Journal Science, 312 (5780), 1644-6
AbstractIn developing embryos of some extant spiralian animals, polar lobe formation is one of the symmetry-breaking mechanisms for segregation of maternal cytoplasmic substances to certain blastomeres and not others. Polar lobe formation leads to unique early cleavage morphologies that include trilobed, J-shaped, and five-lobed structures. Fossil embryos similar to modern lobeforming embryos are recognized from the Precambrian Doushantuo Formation phosphates, Weng’an, Guizhou Province, China. These embryos are abundant and form a developmental sequence comparable to different developing stages observed in lobe-forming embryos of extant spiralians. These data imply that lobe formation is an evolutionarily ancient process of embryonic specification.
Source PubMed, pmid16778054 doi: 10.1126/science.1125964
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