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  2. Professional Sports Authenticator - Wikipedia

    en.wikipedia.org/wiki/Professional_Sports...

    PSA was launched in July 1991 by David Hall, owner of the coin grading company Professional Coin Grading Service (PCGS), to serve collectors as a third-party card grader. [1] At the outset, the business faced difficulties owing to a limited demand from collectors who sought card grading services. [ 2 ]

  3. List of most expensive sports cards - Wikipedia

    en.wikipedia.org/wiki/List_of_most_expensive...

    Cards are evaluated by third-party services, most often Professional Sports Authenticator (PSA), Beckett Grading Services (BGS) and Sportscard Guaranty (SGC), and given a grade on a ten-point scale based on condition. [5] The images below do not necessarily represent the individual specimen sold but are representative of the given cards.

  4. Soluble guanylate cyclase stimulator - Wikipedia

    en.wikipedia.org/wiki/Soluble_guanylate_cyclase...

    Soluble guanylate cyclase (sGC) stimulators are a class of drugs developed to treat heart failure, pulmonary hypertension, and other diseases. The first-in-class medication was riociguat , approved in 2013 for pulmonary hypertension.

  5. Collectors Universe - Wikipedia

    en.wikipedia.org/wiki/Collectors_Universe

    Collectors Universe Inc. is an American company formed in 1986, now based in Santa Ana, California, which provides third-party authentication and grading services to collectors, retail buyers and sellers of collectibles.

  6. Baseball card - Wikipedia

    en.wikipedia.org/wiki/Baseball_card

    The Beckett price guide is a graded card price guide, which means it is graded by a 1–10 scale, one being the lowest possible score and ten the highest. In addition, Professional Sports Authenticator (PSA) grades cards 1–10, and can authenticate autographs as well. Other grading companies include Beckett, SGC, and CGC.

  7. Soluble guanylyl cyclase - Wikipedia

    en.wikipedia.org/wiki/Soluble_guanylate_cyclase

    Heme-free (apo-sGC) no longer responds to NO, but does respond to so-called sGC activator compounds. The latter bind to the empty heme pocket and activate the enzyme in a similar manner to the activation of Fe(II)sGC by NO. In addition, sGC contains an allosteric site, to which sGC stimulators bind.