Fig. 1From: Purification and characterization of thrombin from camel plasma: interaction with camel tick salivary gland thrombin inhibitor a Thrombin clotting time calibration curve. Clotting time is plotted against National Institute of Health (NIH) units of bovine thrombin. b A typical elution profile for the affinity chromatography of camel thrombin on heparin-agarose column (8 × 1.8 cm i.d.)Back to article page