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. 2020 Jan 28;22(4):979–991. doi: 10.1007/s11307-020-01479-8

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© The Author(s) 2020

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Fig. 2 — Immunoreactive fraction assay. The immunoreactive fraction r was extrapolated by a rectangular hyperbolic fit of experimental values (0.025 μg/ml of radiolabeled antibody). The goodness of fit was estimated by the R² metric (r = 77 %, R² = 0.9187).