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24 August 1984
Vol 225, Issue 4664

About The Cover

Orderly arrangement of the photo-receptor mosaic in the compound eye of the house fly revealed by epifluorescence microscopy. As a result of illumination, preselected photoreceptor cells have captured a yellow fluorescent dye which stains each cell down to its synaptic terminal. Present evidence suggests that illumination of these receptors provokes an “induced endocytosis” of the dye which was added to the extracellular space. See page 851. [Michael Wilcox and Nicolas Franceschini, Institut de Neurophysiologie et Psychophysiologie, Centre National de la Recherche Scientifique, Marseille, France]