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Blood intake of fourth instar nymphs after ingestion of 20 μl feeding solution alone (control, n = 22) or containing 15 U human thrombin (thrombin, n = 25). The nymphs were allowed to feed on hamsters immediately after ingesting the feeding solution. Asterisks indicate significant statistical differences (P < 0.05) between groups. Results are represented as the average ± standard error.
