Figure 4.

 Ethidium bromide stained 10% polyacrylamide gel of seminested polymerase chain reaction products (FRIII/LJH and FRIII/VLJH primers) from DNA samples as follows: first nine lanes, non-reproducible bands in Hashimoto’s thyroiditis—three separate blocks from cases 1, 2, and 3; lanes ML-1 and ML-2, pure clonal bands from two cases of thyroid mucosa associated lymphoid tissue lymphoma (these bands were reproducible—results not shown); M, molecular weight markers (size in base pairs).