Clotting time. (A) Representative clotting time curves from absorbance-based turbidity assays using neonatal and adult fibrinogen at equal enzyme concentrations. (B) Maximum turbidity data gathered from clotting curves reveal significant differences between adult and neonatal fibrin clots. Average maximum turbidity ± standard deviation is shown. N = 3 to 6 per group. *P < .05, **P < .01, ***P < .001.