Contents

10 July 1992
Vol 257, Issue 5067

About The Cover

Scanning electron micrograph of a T hybridoma cell undergoing activation-induced apoptotic cell death 6 hours after activation with a monoclonal antibody to the CD3ε molecule. Activation-induced apoptosis in T cell hybridomas is dependent on the expression of c-Myc protein. See page 212. [Photograph: Yufang Shi and Douglas R. Green]