RT-PCR analysis for PGDS gene in human arachnoid villi and meningiomas. PGDS gene is amplified by RT-PCR, and its expression of 342 bp (top) is observed consistently in arachnoid villi (Ar) and all meningioma cases (S, syncytial; T, transitional;F, fibroblastic; Ag, angiomatous;At, atypical types). As an internal control, the expression of GAPDH gene of 600 bp (bottom) is also shown.