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RIA: Use 0.1 ml diluted antiserum. Reagents: A). 0.1 M Phosphate buffered saline, pH 7.4, containing 1% gelatin and 0.01% sodium azide. B). Dextran coated charcoal suspension: 5 grams of charcoal and 0.5 grams dextran in 1 liter of buffer bath for at least 30 minutes before and during use. RIA Protocol: 1. In polypropylene test tubes add 0.1 ml sample or standard, 0.1 ml tritiated tracer and 0.1 ml diluted antiserum. 2. Vortex the tubes. 3. Allow to equilibrate at room temperature for 30 minutes, then at least 15 minutes at 0¼C in an ice/water bath. 4. Add 1 ml cold dextran charcoal solution, keep in ice-water bath for 10 minutes. 5. Centrifuge at 2000 x g for 10 minutes at 4¼C. 6. Remove supernatant from each tube. Add scintillation fluid to supernatant and determine the amount of radioactivity present in the supernatant. Optimal dilutions/concentrations should be determined by the end user.:
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