The expression profile of CEACAM1 in human cancer cell lines. (A) Total RNAs from the indicated cell lines were isolated and subjected to RT-PCR as described in Figure 2. The position of CEACAM1 long and short cytoplasmic domain splice variants is indicated on right. (B) Histogram depicting CEACAM1-S/CEACAM1-L (S:L) ratio in a logarithmic bar graph quantified with NIH ImageJ program. Data represent the mean ± SD of at least three independent experiments.