The invention provides a novel PTH receptor polypeptide, r.DELTA.Nt, characterized by a deletion of the extracellular amino-terminus, ligand binding domain of the receptor. Additionally disclosed are nucleic acid molecules encoding the receptor. The receptor has a minimal domain for ligand binding and is useful in screening assays designed for the identification of agonists and antagonists of PTH receptor activity.

 
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> Modulation of coffee flavour precursor levels in green coffee grains

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