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Plasma sample (0.1 ml) was added and allowed to warm to exactly 30 sec. Pre-warmed 25 mM CaCl2 (at 37° C.) was added and the clotting time was determined by the manual tilt-tube method. The results are shown in FIGS. 1a and 1b. FIG. 1a is a graph of dilute thromboplastin ...