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The article discusses research on the expression of the phospholemman gene in the rectal glands of different shark species from a wide range of geographical locations. It references a study by Feico M. A. H. Schuurmans Stekhoven at Radbound University in Nijmegen, the Netherlands, and his colleagues, published in an issue of "Zoological Studies." The researchers studied the rectal glands found in sharks caught in western Australia, while the rays and Taiwanese sharks were bought from the Tashi and Taichung harbors in Taiwan. They conclude that the absence of phospholemman in some clades of shark families means that this channel cannot be used as a hallmark for phylogeny and classification.