Summary A monospecific antiserum against factor X was prepared in rabbits. The antiserum precipitated factor X in human plasma and serum and monkey serum. The antiserum was used to : 1. demonstrate the presence of factor X precursor in blood from patients under anticoagulant therapy, 2. produce an artificial factor X deficiency substrate useful for testing factor X, 3. study the species specificity of factor X from various common laboratory mammals.
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Prydz et al. (1971) studied this question.