In some autoimmune diseases, antibodies develop that bind with DNA. These same antibodies often also bind to cell membranes. Which of the following statements correctly accounts for this observation?
1) The antibodies have a similar structure to both DNA and cell membranes.
2) The antibodies have a specific binding site that recognizes both DNA and cell membranes.
3) The antibodies are produced by the same type of immune cells that target both DNA and cell membranes.
4) The antibodies are able to change their binding specificity to target both DNA and cell membranes.