Identification and expression of CLLU1. (A) Autoradiogram of differential display screening gel. The 4 patient samples were only used for the screening. (B) Northern blot analysis of CLLU1 expression, using the differential display fragment as probe. The same blot was subsequently probed with a probe specific for β-actin. An ethidium bromide stain of the gel before transfer to the nylon filter is shown at the bottom. The weak bands across the gel at the positions where 28S and 18S rRNAs are located were probably derived from nonspecific hybridization to the rRNAs.