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Pectoral serial sections from wintering (a–d), departing (e–h) and arriving (i–l) white-crowned sparrows stained for succinate dehydrogenase (a,e,i), oil red O (b,f,j), and myosin adenosine triphosphatase following basic (c,g,k) and acidic (d,h,l) pre-incubation. Scale bars, 100 µm.
