In PA103infected cells (Fig. 1C, YFP). Interestingly, the highest signal intensity was detected in a small area close to the nucleus, near or within the Golgi complex (Fig. 1C, merge image, arrows). Consistent with data in Fig. 1A, the YFP emission did not change in cells kept in Ca2 -free medium (Fig. 1D, YFP). Immunostaining of cells with a Golgi marker confirmed that the intense YFP signal in P