Which of the following statements about lymphocytes is incorrect?
A. lymphocytes have integral surface glycoproteins by which they can be recognized
B. once they are mature, they migrate to the bone marrow
C. there are 250 types of CD molecules, some of which are present on lymphocytes
D. the glycoproteins on the surface of a lymphocyte are designated with the prefix CD, for cluster of differentiation
E. B and T lymphocytes cannot be differentiated under the microscope
(this multiple choice question has been scrambled)