Natriuretic Peptides and antagonists

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Gatorwrangler
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Natriuretic Peptides and antagonists

 I am starting a project involving the cardiovascular actions of BNP, currently I am trying to find an antagonist that will effectively target NPR-B, I have come across a few articles that used a microbial polysacharide, HS 142-1, but, the authors did not include the source where others can get access to it. Does anybody out there know of a source for this antagonist? Help is greatly appreciated.