The median absolute difference between distances of CD8.1/CK.1 and CD8.TR1-2/CK.2 was 4.6 μm (Fig. 6D and Fig. S2, available as supplementary data at Bioinformatics online), an acceptable error relative to the median CD8-tumor cell distance (23.1 μm). The gene discussed is CD81; the disease is neoplasm.