Comparison of IgH sequence among different lesions. PG1, first parotid gland biopsy; PG2, second parotid gland biopsy; Neck-LN, neck lymph node; Sp, spleen; Sp-FC, spleen CD10⁺ follicle center cells; IPLN-FC, CD10⁺ follicle center cells of the intraparotid lymph node in the second parotid biopsy. The number in brackets shows the number of common clones of the number of total tumor clones sequenced. Identity to the germline sequences is shown by dashes, replacement mutations by uppercase, and silent mutations by lowercase letters.