Verified locator: Cell 44(1), 21–32 (1986), DOI 10.1016/0092-8674(86)90481-2. Initial-only original bylines D. C. Rio, F. A. Laski and G. M. Rubin; Abstract links 87 kDa/66 kDa products, third-intron processing, immunochemical identification and excision activity.