HAS genes are expressed in MM. Representative GeneScan electropherograms for DNA fragment analysis of HAS gene expression are shown. PCR products were obtained by RT-PCR amplification of fragments of HAS genes and aberrant variants. The x-axes represent molecular size (bp) of PCR product, and the y-axes indicate relative fluorescent units (RFU). The arrows indicate product peaks; faded peaks represent internal size standard peaks of LIZ 500 (ABI). (A) Expression of HAS1 and variants; (B) expression of HAS2; (C) expression of HAS3.