Contents

12 February 1988
Vol 239, Issue 4841

About The Cover

Subsets of developing T lymphocytes from a mouse, stained with fluorescently labeled monoclonal antibodies against the membrane glycoproteins, CD4 and CD8 (×2800). Helper T cells (orange, CD4+), cytotoxic and suppressor T cells (green, CD8+), and immature blast cells and their progeny (yellow, CD4+ and CD8+) each exhibit a characteristic pattern of ion-channel expression. See page 771. [Richard S. Lewis, University of California, Irvine 92717]