 | About the cover
February 2002 - Vol 20 No 2
Nature Biotechnology 20 (2002)
| | |  | An artificial antigen-presenting cell (APC) interacting with a cytotoxic T cell in vitro. June and colleagues have constructed APCs that express ligands for the T-cell receptor, CD28, and the 4−1BB costimulatory molecules (see p. 143). © Doug Struthers.
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