Staining variability across studies, with examples of the annotations performed. Study 2 (stain profile 1), Laboratory A (A, B, C); study 5 (stain profile 2), Laboratory B (D, E, F); study 9 (stain profile 3), Laboratory C (G, H, I). Liver, salivary glands, mandibular lymph node (A, D, G), kidney and urinary bladder (B, E, H), thyroid and parathyroid glands with trachea and esophagus (C, F, I).