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The epithelial sodium channel (ENaC) is composed of three homologous subunits and allows the flow of Na(+) ions across high… Expand BackgroundCollagens provide structural support and guidance cues within the extracellular matrix of metazoans. Mammalian… Expand Epibranchials are among the main dorsal elements of the gill basket in jawed vertebrates (Gnathostomata). Among extant fishes… Expand The vertebrates are traditionally classified into two distinct groups, Agnatha (jawless vertebrates) and Gnathostomata (jawed… Expand The POMC gene is perhaps the most extensively studied member of the opioid/orphanin gene family. In Phylum Chordata this gene has… Expand New specimens of acanthothoracid placoderms and related forms (Romundina, Murrindalaspis, Brindabellaspis) are described… Expand From the shark Scyliorhinus stellaris we cloned and sequenced a cDNA encoding a novel type I keratin, termed SstK10. By MALDI-MS… Expand A vertebral column consisting of a persistent notochord and ossified arcocentra is the primitive condition for Gnathostomata; it… Expand Abstract. It is commonly acknowledged that cartilaginous fishes, Chondrichthyes, have a basal position among the Gnathostomata… Expand Abstract. Lungfish are a unique order of sarcopterygian fish cleidographically positioned between tetrapods and fish. An… Expand