54Mn2+ added to human or rabbit plasma in vitro combines selectively with the albumin fraction. At pH 7.0, the Scatchard plot yields a curve that may be resolved for two classes of sites: one, where n1 = 1 and K1 = 2.4 × 104, the other where n2 = 0.5 and K2 = 0.5 × 103.Zn2+, Ni2+ and Co2+ can compete effectively for these sites.
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