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Correlation graphs showing affinity measured in binding assays at cloned rat brain A3 receptors (stably transfected CHO cells, using [125I]APNEA as radioligand) vs. cloned A3 receptors from sheep (A, using [125I]ABA as radioligand) or from human (B, using [125I]ABA as radioligand) brain. Values at sheep and human receptors were from Linden et al. [1993] and Salvatore et al. [1993]. Linear regression analysis for each set of data calculated r2 values of < 0.105 (A) and 0.995 (B).
