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Morphological appearance of the fibrillary (green fluorescence) as opposed to the globular (red fluorescence) actin in the cytoskeletons of the untreated human umbilical vein endothelial cells (HUVECs; upper figure) or of the HUVECs treated for 3 hrs with 10 nM gastrin (lower figure). For further details, see Lefranc et al. on page 8250.