Individual values for the tTg-IgA Celikey assay (A), the tTG-IgG Celikey assay (B), the DGP (IgA+IgG) screen (C), and the tTG-IgA Immulite 2000 assay (D), stratified according to the Marsh grading of biopsy findings. Individual values for the tTg-IgA Celikey assay (A), the tTG-IgG Celikey assay (B), the DGP (IgA+IgG) screen (C), and the tTG-IgA Immulite 2000 assay (D), stratified according to the Marsh grading of biopsy findings. Dashed lines represent assay cutoff values, and bars represent median Ab levels. Miriam Parizade et al. Clin. Vaccine Immunol. 2009; doi:10.1128/CVI.00205-09