The Golgi apparatus was investigated by co-staining fixed cells with either NRB-AF12 or ER-Tr, and antibodies directed against the Golgi structural protein GM130 (α-GM130). Data obtained, shown in Figure 5A, indicates a co-localization of NRB-AF12 and α-GM130 (Pearson's coefficient: 0.53 ± 0.02; n ≥ 10; Figure 5C). Similar results were obtained when α-GM130 was used in combination with ER-Tr (Pearson's coefficient: 0.58 ± 0.02; n ≥ 10; Figures 5B,C).