ID2 and B-cell chronic lymphocytic leukemia: Consistent with recently published gene expression microarray data [37], co-culture with HUVEC cells led to up-regulation of ID2 and or ID3 protein expression in CLL cells, an affect that was modulated by PEITC depletion of GSH or by direct addition of GSH or L-cysteine to an extent commensurate with rescue from cell death.