In bowl, combine flours, bran, sugar, caraway seeds, baking powder, baking soda and salt. Cut in butter, finely. Combine egg and buttermilk. Add all at once to the flour mixture, stirring with a fork, to make a soft, slightly sticky dough. Turn out on a floured surface, knead gently 10 times. Divide in half. Shape into two round loaves. Place on greased baking sheet. Cut X-shape slash in top of each loaf. Bake at 375F oven about 35 to 45 minutes, or until loaf sounds hollow when tapped on bottom. Yields 2 loaves.