Be He aL oy Explanation of Plates Plate 1. Residual ~ beta burn” on abdominal wall of Case K-5 in 1964. Plate 2. Section of skin trom “beta burn” area shown in Plate 1 (100 x >. Plate 3. Section of skin from “beta burn” area of abnominal wall of Case K-12 in 1964 C100 « ). Plate 4. . Section of skin from non-exposed area of abdominal wall of Case K-12 in 1964 (100 ). Compared with Plate 4, Plate 2 and 3 reveal atrophy of epidermis with narrowed stratum granulosum and elongation of rete pegs. Fibrosis and collapsed "84 blood capillaries are seen subepidermally. Plate 5. A metaphase from Case K-4+. Plate 6, Akaryotype from Case K-J6. A dicentric chromosome is observed. It reveals an unusual acrocentric chromosome.