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SRA_1 and SRA_2 show specific affinity toward thrombin with nM dissociation constants and negligible binding to streptavidin. RT-PCR determination of dissociation constants for SRA_1 (A) and SRA_2 (B) yields Kd values of 99.3 ± 12.9 nM and Kd = 93.6 ± 14.2 nM, respectively.
