Fig. 1. Enrichment of Arl1 on vesicular-tubular structures on the trans-side of the Golgi. Cryosections derived from CHO cells were labeled with Arl1 antibodies (large arrowheads) followed by 9 nm gold-particle-conjugated protein A (upper). Cryosections were also double-labeled with Arl1 antibodies followed by 14 nm gold particle-conjugated protein A (large arrowheads) as well as a monoclonal antibody against -adaptin followed by 9 nm gold particle-conjugated protein A (small arrowheads) (lower). Bars: 100 nm. G, Golgi.