Northern blot analysis of HNSCC SEREX clones. The expression of clones AU-HN-4 (A), AU-HN-18 (B), AU-HN-25 (C), and AU-HN-6 (D) was assayed in the following normal human tissues: (1) spleen, (2) thymus, (3) prostate, (4) testis, (5) ovary, (6) small intestine, (7) colon, and (8) lymphocytes.