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Effect of diet upon isotype correlations. The titers of IgG and IgA against DGP and tTG were evaluated and plotted against each other for celiac patients. For mixed (treated and untreated) celiac patients, the Spearman’s rank correlation coefficients were r = 0.75 for DGP (A) and r = 0.52 for tTG (B). For untreated celiac patients, r = 0.78 for DGP (C) and r = 0.60 for tTG (D). For treated celiac patients, r = 0.58 for DGP (E) and r = 0.44 for tTG (F).
