THE CAMBRIAN FOSSIL PIKAIA, AND THE ORIGIN OF CHORDATE SOMITES

The Cambrian fossil Pikaia, and the origin of chordate somites

Abstract The Middle Cambrian fossil Pikaia has a regular series of vertical bands that, assuming chordate affinities, can be interpreted as septa positioned between serial myotomes.Whether Pikaia has a notochord and nerve cord is less certain, as the dorsal organ, which has no obvious counterpart in living chordates, is the only clearly defined axi

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Genetics of primary congenital hypothyroidism: three decades of discoveries and persisting etiological challenges

Primary congenital hypothyroidism (CH) is the Ester-C most common neonatal endocrine disorder, and may be etiologically subdivided into thyroid dysgenesis, referring to abnormal thyroid development, and dyshormonogenesis, where a defective thyroid hormone biosynthesis pathway results in inadequate hormone production despite a structurally intact gl

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Diversity of phytoplankton in some domestic wastewater-fed urban fish pond ecosystems of the Chota Nagpur Plateau in Bankura, India

Abstract The present limnological investigation is conducted to study the relationship between phytoplankton abundance and five important physicochemical factors in urban wastewater-fed seven fish ponds of Chota Nagpur Plateau area.A total number of 43 phytoplankton taxa representing four classes, namely Cyanophyceae (7), Chlorophyceae (29), Bacill

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