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We described a new, specific and easy to use radioimmunoassay (RIA) of estrone sulfate (E1S) in males. After synthesis of an E1S-6-(O-carboxymethyl) oxime hapten then coupling to BSA, we obtained a specific anti-E1S antiserum. Although the cross-reactivity of DHEAS with our anti-E1S antiserum was low (CR=0.002%), we confirmed the absolute necessity of separating plasma DHEAS from plasma E1S, before...
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