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The Eu(III) 7 F 0 -> 5 D 0 excitation spectra of the parvalbumins are highly pH-dependent. Below pH 6.0, they exhibit a sharp, partially resolved doublet centered near 5,795 Å. However, as the pH is raised, the spectrum becomes increasingly dominated by a much broader signal near 5,784 Å. This behavior has been traced to the Eu(III) ion bound at the CD site, but...
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