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Fig. 4. Testing the algorithm. The top panel shows that the algorithm correctly identified 96% of a test set of 100 known GPCRs and produced no false positives. The middle panel shows the performance of the algorithm on 100 amino-acid stretches of GPCRs and non-GPCRs. The bottom panel shows the performance of the algorithm, following retraining, with a set of GPCRs and ion channels.