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The phylogenetic relationships between the two southern hemisphere lamprey families (Geotriidae and Mordaciidae) and their northern hemisphere counterparts (Petromyzontidae) are unresolved. Insulin was isolated from an extract of islet-containing intestinal tissue from ammocoetes of the Australian lamprey, Mordacia mordax. Its primary structure was established as A-chain: GIVEQCCHRK 10 ...
The traditional view that Testudines (tortoises and turtles) should be regarded as the surviving clade of the anapsid reptiles rather than classified with the diapsid reptiles (snakes, lizards, and crocodiles) has recently been challenged. Neuropeptide Y, neuropeptide γ, and somatostatin-14 were isolated from an extract of the brain, substance P and galanin from an extract of the intestine, and insulin...
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