The Experts below are selected from a list of 1110 Experts worldwide ranked by ideXlab platform
Earl T Larson - One of the best experts on this subject based on the ideXlab platform.
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functional characterization of two melanocortin mc receptors in lamprey showing orthology to the mc1 and mc4 receptor subtypes
BMC Evolutionary Biology, 2007Co-Authors: Tatjana Haitina, Janis Klovins, Akiyoshi Takahashi, Maja Lowgren, Aneta Ringholm, Johan Enberg, Hiroshi Kawauchi, Earl T LarsonAbstract:Background The melanocortin (MC) receptors have a key role in regulating body weight and pigmentation. They belong to the rhodopsin family of G protein-coupled receptors (GPCRs). The purpose of this study was to identify ancestral MC receptors in Agnathan, river lamprey.
Hans-joachim Paepke - One of the best experts on this subject based on the ideXlab platform.
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Kritischer Katalog der Typen der Fischsammlung des Zoologischen Museums Berlin. Teil 2: Agnatha, Chondrichthyes
Mitteilungen aus dem Museum für Naturkunde in Berlin. Zoologisches Museum und Institut für Spezielle Zoologie (Berlin), 2008Co-Authors: Hans-joachim Paepke, Karin SchmidtAbstract:Critical Catalogue of the Types of the Fish Collection of the Zoological Museum Berlin. Part 2: Agnatha, Chondrichthyes This paper is the second part of the catalogue of the Agnatha and fish types stored at the Zoological Museum of the Humboldt-University of Berlin. It includes the types of the Agnatha classes Myxini and Cephalaspidomorphi with the orders Myxiniformes and Petromyzontiformes as well as the types of the Gnathostomata class Chondrichthyes with the orders Chimaeriformes, Squaliformes, Squatiniformes, Orectolobiformes, Lamniformes, Carcharhiniformes, Torpediniformes, Rajiformes and Myliobatiformes. Some remarks about the history and special problems of the research activities on this groups in the 19th century in Berlin (connected with the names of J. MULLER and F. G. J. HENLE as well as some others) are given in a short introduction.
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Kritischer Katalog der Typen der Fischsammlung des Zoologischen Museums Berlin. Teil 3: Notothenioidei, Callionymoidei
Mitteilungen aus dem Museum für Naturkunde in Berlin. Zoologisches Museum und Institut für Spezielle Zoologie (Berlin), 2008Co-Authors: Ronald Fricke, Hans-joachim PaepkeAbstract:Critical Catalogue of the Types of the Fish Collection of the Zoological Museum Berlin. Part 3: Notothenioidei, Callionymoidei. This paper is the third part of the catalogue of Agnatha and fishes stored at the Zoological Museum of the Humboldt University in Berlin. It includes the types of the families Nototheniidae, Bathydraconidae, Channichthyidae and Callionymidae. Methods are the same as in parts 1 and 2 of the catalogue.
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Kritischer Katalog der Typen der Fischsammlung des Zoologischen Museums Berlin Teil 4: Scorpaeniformes
Mitteilungen aus dem Museum für Naturkunde in Berlin. Zoologisches Museum und Institut für Spezielle Zoologie (Berlin), 2008Co-Authors: Hans-joachim Paepke, Ronald FrickeAbstract:Critical Catalogue of the Types of the Fish Collection of the Zoological Museum Berlin. Part 4: Scorpaeniformes. This paper is the fourth part of the catalogue of Agnatha and Fishes stored at the Zoological Museum of the Humboldt University in Berlin. It includes the types of the families Scorpaenidae, Aploactinidae, Congiopodidae, Triglidae, Platycephalidae, Hoplichthyidae, Anoplopomatidae, Hexagrammidae, Cottidae, Cottocomephoridae, Psychrolutidae, Agonidae, and Cyclopteridae. Methods are the same as in parts 1 to 3 of the catalogue.
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Kritischer Katalog der Typen der Fischsammlung des Zoologischen Museums Berlin Teil 6: Anabantoidei
Mitteilungen aus dem Museum für Naturkunde in Berlin. Zoologisches Museum und Institut für Spezielle Zoologie (Berlin), 2008Co-Authors: Hans-joachim PaepkeAbstract:Critical Catalogue of the Types of the Fish Collection of the Zoological Museum Berlin. Part 6: Anabantoidei The sixth part of the type catalogue of the Agnatha and Fishes stored at the Zoological Museum of the Humboldt-University in Berlin includes the types of the suborder Anabantoidei. Some aspects about the types of this group are already published by the author (concerning Chaetodon chinensis BLOCH 1790, Trichogaster fasciatus BLOCH & SCHNEIDER 1801, Macropodus concolor AHL 1937), other are still at work (concerning Ctenopoma multispinis PETERS 1844, Ctenopoma nigropannosum REICHENOW 1875).
Kazuyoshi Tsutsui - One of the best experts on this subject based on the ideXlab platform.
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immunohistochemical detection of prolactin releasing peptide2 in the brain of the inshore hagfish eptatretus burgeri
General and Comparative Endocrinology, 2019Co-Authors: Masafumi Amano, Noriko Amiya, Naoyuki Yamamoto, Tomohiro Osugi, Kazuyoshi TsutsuiAbstract:Abstract Prolactin-releasing peptide2 (PrRP2) belongs to the RFamide peptide group and is a paralog of prolactin-releasing peptide (PrRP). Recent studies demonstrated that PrRP2, but not PrRP, regulates prolactin release in teleosts. The evolutionary origin of PrRP and PrRP2 dates back to at least early vertebrates because homologs of PrRP/PrRP2 were identified in lampreys, one of the earliest branch of vertebrates class Agnatha. However, PrRP/PrRP2 remains to be identified in hagfish, another representative species of class Agnatha. Here, we examined the distribution of PrRP2 in the brain and pituitary of the inshore hagfish Eptatretus burgeri to obtain further understanding of the neuroendocrine system of PrRP2. PrRP2-immunoreactive (ir) cell bodies were detected in the infundibular nucleus of hypothalamus (HYinf). PrRP2-ir fibers were restricted around PrRP2-ir cell bodies and were not detected in the dorsal wall of the neurohypophysis compared to the abundant PrRP2-ir fiber distribution in the brain and innervation to the pituitary in other vertebrates. To examine possible reciprocal connections of PrRP2 and other neuropeptides, we further conducted dual-label immunohistochemistry of PrRP2 and the PQRFamide (PQRFa) peptide or corticotropin-releasing hormone (CRH). Reciprocal connections are suggested between PrRP2 and PQRFa neurons as well as between PrRP2 and CRH neurons. The present study demonstrates, for the first time, that PrRP2 is expressed in the brain of inshore hagfish. The restricted distribution of PrRP2-ir fibers in the HYinf suggests that PrRP2 does not directly regulate the pituitary gland, but regulates the function of the HYinf where PQRFa and CRH are expressed.
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Immunohistochemical detection of prolactin-releasing peptide2 in the brain of the inshore hagfish Eptatretus burgeri.
General and Comparative Endocrinology, 2018Co-Authors: Masafumi Amano, Noriko Amiya, Naoyuki Yamamoto, Tomohiro Osugi, Kazuyoshi TsutsuiAbstract:Abstract Prolactin-releasing peptide2 (PrRP2) belongs to the RFamide peptide group and is a paralog of prolactin-releasing peptide (PrRP). Recent studies demonstrated that PrRP2, but not PrRP, regulates prolactin release in teleosts. The evolutionary origin of PrRP and PrRP2 dates back to at least early vertebrates because homologs of PrRP/PrRP2 were identified in lampreys, one of the earliest branch of vertebrates class Agnatha. However, PrRP/PrRP2 remains to be identified in hagfish, another representative species of class Agnatha. Here, we examined the distribution of PrRP2 in the brain and pituitary of the inshore hagfish Eptatretus burgeri to obtain further understanding of the neuroendocrine system of PrRP2. PrRP2-immunoreactive (ir) cell bodies were detected in the infundibular nucleus of hypothalamus (HYinf). PrRP2-ir fibers were restricted around PrRP2-ir cell bodies and were not detected in the dorsal wall of the neurohypophysis compared to the abundant PrRP2-ir fiber distribution in the brain and innervation to the pituitary in other vertebrates. To examine possible reciprocal connections of PrRP2 and other neuropeptides, we further conducted dual-label immunohistochemistry of PrRP2 and the PQRFamide (PQRFa) peptide or corticotropin-releasing hormone (CRH). Reciprocal connections are suggested between PrRP2 and PQRFa neurons as well as between PrRP2 and CRH neurons. The present study demonstrates, for the first time, that PrRP2 is expressed in the brain of inshore hagfish. The restricted distribution of PrRP2-ir fibers in the HYinf suggests that PrRP2 does not directly regulate the pituitary gland, but regulates the function of the HYinf where PQRFa and CRH are expressed.
Jan Klein - One of the best experts on this subject based on the ideXlab platform.
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Composite origin of major histocompatibility complex genes.
Current Opinion in Genetics & Development, 2004Co-Authors: Jan Klein, Colm O'huiginAbstract:Abstract Major histocompatibility complex WHO genes have now been cloned from representatives of all vertebrate classes except Agnatha. The recent accumulation of sequence data has given great insight into the course of evolution of these genes. Although the primary structure of the MHC genes varies greatly from class to class and also within the individual classes, the general features of the tertiary and quaternary structure have been conserved remarkably well during more than 400 million years.of evolution. The ancestral MHC genes may have been assembled from at least three structural elements derived from different gene families. Class II MHC genes appear to have been assembled first, and then to have given rise to class I genes.
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molecular phylogeny of early vertebrates monophyly of the Agnathans as revealed by sequences of 35 genes
Molecular Biology and Evolution, 2003Co-Authors: Naoko Takezaki, Felipe Figueroa, Zofia Zaleskarutczynska, Jan KleinAbstract:: Extant vertebrates are divided into three major groups: hagfishes (Hyperotreti, myxinoids), lampreys (Hyperoartia, petromyzontids), and jawed vertebrates (Gnathostomata). The phylogenetic relationships among the groups and within the jawed vertebrates are controversial, for both morphological and molecular studies have rendered themselves to conflicting interpretations. Here, we use the sequences of 35 nuclear protein-encoding genes to provide definitive evidence for the monophyly of the Agnatha (jawless vertebrates, a group encompassing the hagfishes and lampreys). Our analyses also give a strong support for the separation of Chondrichthyes (cartilaginous fishes) before the divergence of Osteichthyes (bony fishes) from the other gnathostomes.
О Б Афанасьева - One of the best experts on this subject based on the ideXlab platform.
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Экзоскелет позвоночных: геометрические закономерности формирования рельефа панциря у ранних бесчелюстных (Agnatha, Vertebrata)
2019Co-Authors: О Б АфанасьеваAbstract:На основании анализа данных по строению твёрдых покровов у различных таксонов костнопанцирных бесчелюстных (Osteostraci, Agnatha) выявлены геометрические закономерности формирования возможных вариантов рельефа панциря при морфогенезе наружного скелета позвоночных (Vertebrata). Предложена циркулярная модель построения рельефа поверхности экзоскелета. Показано, что уже у ранних позвоночных существовал механизм, обеспечивающий реализацию полного набора вариантов формирования скульптуры различных типов.
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The exoskeleton of vertebrates: the geometric regularities of the formation of armor relief in early jawless vertebrates (Agnatha, Vertebrata)
Доклады Академии наук, 2019Co-Authors: O. B. Afanassieva, О Б АфанасьеваAbstract:Based on the analysis of information on the structure of the hard cover of different taxons of osteostracan jawless vertebrates (Osteostraci, Agnatha), the geometric regularities of the formation of possible variants of armor relief during the exoskeletal morphogenesis of vertebrates are revealed. A circular model of the сonstruction of superficial relief is proposed. It is shown that the early vertebrates have already possessed the mechanism providing realization of complete set of variants of the formation of exoskeletal sculpture of different types.
