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About the Cover
Cover: A pair of downstream-migrating, juvenile sea lampreys (Petromyzon marinus L.) that have just completed their transformation from substrate-dwelling, filter feeders into free-swimming, parasitic feeders. Lampreys are the most primitive osmoregulating vertebrates and this species has an anadromous life history. During metamorphosis branchial seawater-type mitochondria-rich cells first appear, gill Na+/K+-ATPase activity increases and hypo-osmoregulatory ability improves markedly, all indicating a preparatory adaptation for life at sea (see article by P. Reis-Santos, S. D. McCormick and J. M. Wilson, pp. 978−988), and abundant Na+/K+-ATPase (red staining) is associated with these cells. Photos by Jonathan Wilson; thanks to Dr Carlos Antunes for supplying the lampreys.
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