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About the Cover


Enlargements of the reverse sides of the Australian 5¢ and 20¢ coins, illustrationg the echidbna(Tachyglossus aculeatus, top) and the platypus (Ornithorhynchus anatinus, bottom). The milk of these egg-laying mammals contains unusual caaarbohydrates. See page 210.[Jutta Hösel, Melbourne, Australia]


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Science. ISSN 0036-8075 (print), 1095-9203 (online)