A method for characterization of endogenous ligands to orphan receptors belonging to the steroid hormone receptor superfamily--isolation of progesterone from pregnancy plasma using progesterone receptor ligand-binding domain.


An analytical method is described whereby progesterone is isolated from pregnancy plasma on the basis of the high affinity and specificity of the progesterone receptor for its ligand. Partially purified progesterone receptor ligand-binding domain, expressed as a protein A fusion protein in Escherichia coli, is incubated with a neutral steroid fraction… (More)


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