Figure 1.

Expression of L^d, B7-1, and ICAM-1 by transfected Drosophila cells. Drosophila cells were transfected with cDNAs encoding L^d, β₂-microglobulin, B7-1, and ICAM-1 under the control of the metallothionein promoter as described. Transfected cells were separated with a FACS to obtain cells expressing L^d molecules and were maintained in vitro. The data show L^d, B7-1, and ICAM-1 expression on the cell lines 24 hr after induction with 1 mM CuSO₄. The higher staining for B7-1 on L^d.B7.ICAM than L^d.B7 cells was not seen in other experiments.