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Nucleotide-induced membrane ruffling in microglia. The cells were stimulated with PBS (A) or 50 μm ATP (B), ADP (C), or UTP (D) for 5 min. After fixation, the cells were stained with Texas Red-conjugated phalloidin. ATP and ADP clearly induced membrane ruffling (indicated byarrows). Scale bar, 20 μm.
