Expression of trophinin, tastin, and bystin proteins and their transcripts in the chorionic villi from tubal pregnancy. Immunohistochemistry for trophinin (A), tastin (B), bystin (C), second antibody alone (D), and in situ hybridization for trophinin (E, antisense; H, sense), tastin (F, antisense; I, sense), and bystin (G, antisense; J, sense) using digoxigenin-labeled RNA probes. All photographs presented are in the same magnification, and the bar in (J) indicates 200 μm. (cv, chorionic villi; t, trophoblasts).