W135P, dissolved in 10 ml of 0.2 M NaCl at 5 mg/ml, was ultrasonicated for 60 min using an ultrasonic homogenizer (sonicator) with a tapered microprobe under a stream of N2 at room temperature and then precipitated by 75% alcohol, dialyzed, and freeze-dried (30).

Probe: OR-T-156

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