Results 121 to 130 of about 1,321 (169)
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RFamide peptides in agnathans and basal chordates
General and Comparative Endocrinology, 2016Since a peptide with a C-terminal Arg-Phe-NH2 (RFamide peptide) was first identified in the ganglia of the venus clam in 1977, RFamide peptides have been found in the nervous system of both invertebrates and vertebrates. In vertebrates, the RFamide peptide family includes gonadotropin-inhibitory hormone (GnIH), neuropeptide FF (NPFF), prolactin ...
Tomohiro Osugi +2 more
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Agnathans and the origin of jawed vertebrates
Nature, 1993The origins of jawed vertebrates (gnathostomes) lie somewhere within the ranks of long-extinct jawless fishes, represented today as the lampreys and hagfishes. Recent discoveries of hitherto unknown kinds of jawless fishes (agnathans), together with re-examination of known agnathans and advances in systematic methods, have revitalized debates about the
Philippe Janvier
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Agnathans recent and fossil, and the origin of jawed vertebrates
Reviews in Fish Biology and Fisheries, 1995During the last 15 years we have gained considerably more knowledge about the anatomy, physiology and molecular sequences of the modern agnathans. This knowledge has been analysed with modern systematic techniques which provide clear, unambiguous statements of relationships.
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Origins of the descending spinal projections in petromyzontid and myxinoid agnathans
Journal of Comparative Neurology, 1989AbstractThe origins of the descending spinal pathways in sea lampreys (Petromyzon marinus), silver lampreys (Ichthyomyzon unicuspis), and Pacific hagfish (Eptatretus stouti) were identified by the retrograde transport of horseradish peroxidase (HRP) placed in the rostral spinal cord. In lampreys, the majority of HRP‐labeled cells were located along the
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Physiological adaptations of the living agnathans
Earth and Environmental Science Transactions of the Royal Society of Edinburgh, 1989ABSTRACTThe modes of life and environments of the extant agnathans (cyclostomes) are discussed in relation to their adaptations to temperature, light, oxygen and salinity. As their antitropical distribution indicates, both hagfishes and lampreys are cold water groups.
Hardisty, M.W. +2 more
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Agnathan brain anatomy and craniate phylogeny
Acta Zoologica, 2009AbstractThe central nervous system of hagfishes displays unique characteristics that are distinct from any other craniate neuroanatomic features. Whether these hagfish characters are general for all craniates, autapomorphies of hagfishes, or merely a derived state of the general cyclostome condition is still a matter of debate that relates to the ...
Khonsari, Roman Hossein +4 more
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Biglycan-Like Extracellular Matrix Genes of Agnathans and Teleosts
Journal of Molecular Evolution, 2000Biglycan and decorin are two members of a family of small extracellular matrix proteoglycans characterized by the presence of 10 leucine-rich repeats and one or two attachment sites for glucosaminoglycans. Both have thus far been described only from tetrapod species, mainly mammals.
S, Shintani +4 more
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[Progress of adaptive immunity system of agnathan vertebrates].
Yi chuan = Hereditas, 2009Extant jawless vertebrates, represented by lampreys and hagfishes, have innate immune receptors with variable domains structurally resembling T/B-cell receptors. However, they lack cardinal elements of adaptive immunity shared by all jawed vertebrates: T/B-cell receptors and major histocompatibility complex molecules.
Jiao, Liang +3 more
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Glutamine metabolism in elasmobranch and agnathan muscle
Journal of Experimental Zoology, 1992AbstractGlutamine metabolism was investigated in the little skate (Raja erinacea), spiny dogfish (Squalus acanthias), and hagfish (Myxine glutinosa). Amino acid analysis revealed that dogfish plasma glutamine concentration was 11.6 nmol/ml, whereas 48‐fold higher levels, 0.56 μmol/gm, were found in the red muscle.
M. E. Chamberlin, J. S. Ballantyne
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