Expression ofCASP8AP2in leukemic lymphoblasts. (A) Expression of CASP8AP2 transcripts by RT-PCR in ALL cell lines and 10 primary ALL samples. (B) Expression of CASP8AP2 protein by flow cytometry in 2 cases of ALL. Overlay histograms indicate staining with anti-CASP8AP2 antibody and with nonreactive rabbit immunoglobulin (Control Ig) in each sample. The corresponding CASP8AP2 signal by gene array in each sample is shown. (C) Relation between CASP8AP2 transcript expression by gene array and protein expression by flow cytometry. Spearman correlation coefficient is shown.