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Fig. 4. Number of lymphocytes (medians ±0.5 interquartile intervals) per
1000 erythrocytes counted on stained thin blood smears of adult male house
finches treated with testosterone-filled (black circles; N=10) or
control (white circles; N=10) Silastic capsules. Capsules were
implanted on Day 0. All birds received one weekly injection of sheep red blood
cells for 4 weeks starting on Day 13.