Combine the bran cereal and orange juice; let stand several minutes for bran to absorb juice. In a separate bowl, combine flour, sugar, baking powder and salt. Stir egg and oil into bran until well mixed. Add bran mixture and chopped nectarines to dry ingredients; stir only until dry ingredients are moistened. (Batter will be thick and lumpy.) Spoon batter into 12 greased muffin cups. Bake in 400° F oven for 25 minutes or until golden brown. Remove from pan and serve hot.