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Chemical structure of Alexa dye (top). Smooth muscle actin (αSM actin, in red Alexa 594) (bottom left) and neurofilament M200 (NF-M200, in green Alexa 488) (bottom middle); merged shows αSM actin-negative cells (white arrows) (bottom right) (magnification 20×).
From Bouchez et al. 2008.
