JEB -- Koldkjær et al. 207 (2): 357 Figure IG5

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Fig. 5. Seasonal fluctuations in plasma testosterone (A) and plasma oestradiol-17ß concentrations (C) in relation to fluctuations in red blood cell (RBC) ß-adrenergically stimulated RBC Na⁺/H⁺ exchanger (ßNHE) activity (B). The dotted line illustrates the mean Na⁺ influx at the times of the year when the ß-NHE activity is not downregulated. Values are means ± S.E.M. (N=8).